Citronella plant care is quite beginner-friendly – with the right light, watering, and a bit of pruning, you can successfully cultivate this aromatic plant inside your home.

Growing a citronella plant indoors is a rewarding way to enjoy its lemony fragrance year-round. This scented geranium (scientific name Pelargonium citrosum) is often called the “mosquito plant” for its citrus scent, and it makes a lovely houseplant with its lacy green foliage.

 

In this guide, we’ll walk you through everything you need to know about indoor citronella plant care, from light requirements and watering schedules to pruning, propagation, and troubleshooting common problems. Let’s get started on helping your indoor citronella thrive!

Pelargonium citrosum, commonly known as the citronella plant, mosquito plant, or citrosa geranium, is a type of scented geranium prized for its citrusy aroma and attractive foliage​.

Unlike true citronella grass (which is a different plant), this geranium’s deeply lobed, textured leaves release a lemony citronella scent when crushed or brushed​. 

The plant typically grows about 1–2 feet tall and wide indoors​, and may produce occasional small pinkish-purple flowers, though it’s grown more for its fragrance than its blooms.

Originally from warm climates (hardy only in USDA zones 9–11), the citronella plant is not frost-tolerant​.

This means it’s often kept as a potted plant that can be brought indoors during colder months. Indoors, it remains an evergreen perennial, adding year-round greenery and scent to your space. 

Many people like to place it on sunny windowsills, sunrooms, or patios in summer and then move it inside to overwinter.

It’s important to note that despite its nickname, simply growing a citronella plant will not magically repel mosquitoes throughout your home. 

Research has shown that the mosquito-repelling claims are not proven​ – the plant’s oils do have insect-repellent properties, but they are only released when the leaves are crushed. 

So think of this plant as a fragrant, decorative houseplant rather than an insect repellent solution. With that expectation set, let’s dive into the essentials of citronella plant care indoors.

 

Citronella Plant Care Essentials

For a quick reference, here are the basic indoor care requirements for a healthy citronella plant:

• Light:
  Bright light with direct sun for at least a few hours daily is ideal​. A south or west-facing window is perfect. Insufficient light leads to leggy growth.
• Water:
  Water moderately. Allow the top inch (2–3 cm) of soil to dry out between waterings.  Do not overwater – soggy soil can cause root rot.
• Soil:
  Use a well-draining potting mix​ A loose, loamy soil with perlite or sand mixed in will prevent waterlogging.
• Temperature:
  Keep in normal room temperatures of 65–80°F (18–27°C). Avoid cold drafts; below about 50°F (10°C) the plant will suffer​.
• Humidity:
  Average indoor humidity (around 40-50% relative humidity) is fine​. The plant tolerates lower humidity but appreciates some moisture in the air.
• Fertilizer:
  Light feeder – apply a balanced houseplant fertilizer at half-strength about once a month during spring and summer​. No need to feed in winter when growth slows.
• Potting:
  Plant in a pot with good drainage holes. Terra cotta pots can help excess moisture evaporate. Repot to a slightly larger pot only when root-bound.
• Safety:
  Toxic to pets – like many geraniums, citronella plant leaves can cause stomach upset if ingested.  Keep it out of reach of curious pets and children.

Now, let’s break down each aspect of citronella plant care in detail so you know exactly how to keep your indoor “mosquito plant” happy and healthy.

 

Light Requirements

Indoors, light is one of the most important factors for citronella plant care. This plant thrives in bright light and sun – in fact, the more direct sunlight you can give it, the better. Aim to provide at least 4–6 hours of direct sun each day if possible​.

A south-facing window is usually ideal, since it gets strong light for much of the day. West-facing windows can also work, providing good afternoon sun. 

If you only have east or north windows, try to move the plant to the brightest spot available or supplement with a grow light, as those exposures might not be intense enough.

Why so much light? In low light conditions, citronella plants will stretch out and become leggy. You might notice the stems growing long, thin, and floppy with fewer leaves – a sure sign it’s not getting enough sun​.

Such a plant will weaken and may even topple over under its own weight. To avoid this, give your citronella plenty of illumination. Bright, direct light makes the plant bushier and more robust​, with dense foliage and a compact shape.

If you see your plant leaning toward the light source, remember to rotate the pot every week or so. Turning the plant periodically will ensure all sides get light and promote even growth (preventing a lopsided, one-sided plant). 

Also, keep the leaves clean and dust-free – dusty leaves can block sunlight. Gently wiping the foliage with a damp cloth every now and then (or giving the plant a brief lukewarm shower) will help it absorb maximum light​.

Avoiding Sunburn: While citronella geraniums love sun, you should still be a bit cautious in extremely intense light. 

If your plant is right up against a hot window in midsummer, the glass can magnify sunlight and potentially scorch the leaves. 

You might observe leaf edges turning dry or brown if the sun is too intense. If that happens, provide a sheer curtain during the harshest afternoon rays or move the plant a foot back from the window. 

Generally, though, indoors sun intensity is seldom a problem – lack of light is the more common issue to watch out for. So when in doubt, err on the side of more brightness for your citronella plant.

 

Watering Schedule

Knowing when and how to water your indoor citronella plant is key to its care. These plants like consistent moisture but absolutely hate sitting in waterlogged soil. 

The trick is to strike a balance: water thoroughly, then wait until the plant just starts to dry before watering again. Here’s how to establish a good watering routine:

• Check the soil.
  Before watering, always feel the top inch (2–3 cm) of the potting mix with your finger. If the top inch is dry to the touch, it’s time to water​.
  If it’s still slightly damp, wait a few more days and check again. Citronella plants prefer not to completely dry out for long periods, but they also don’t want to be constantly soaked. Moist, but not soggy is the goal​.
• Water deeply.
  When you do water, water thoroughly until you see excess water drain out of the bottom of the pot. This ensures the entire root ball gets a good drink​.
  Use room-temperature water and pour it evenly around the soil surface. If using a saucer under the pot, be sure to empty any drained water after a few minutes – you don’t want the plant’s roots sitting in that. Good drainage is essential.
• Drainage is a must.
  Always keep your citronella in a pot with drainage holes. Without drainage, water will accumulate and the roots can rot.
  If your decorative pot has no holes, use it as a cachepot (place the plant in a plastic nursery pot inside the decorative pot, so you can remove it to water and drain).
• Frequency.
  How often to water will depend on your home’s environment. In a warm, sunny spot, the plant might dry out faster (perhaps needing water once per week).
  In cooler or lower-light conditions, watering every 10–14 days might be sufficient. Rather than sticking to a strict schedule, it’s best to monitor the soil moisture regularly. Over time, you’ll get a feel for your plant’s rhythm.
• Signs of overwatering: Watch out for symptoms of too much water. Yellowing leaves and a musty smell from the soil can indicate overwatering and potential root rot​.
  If the soil stays wet for too long, the roots suffocate and rot, causing the plant to decline.
  Should you notice yellow leaves (especially on the lower parts of the plant) and the soil is constantly wet, scale back on watering immediately. Let the soil dry out more before the next drink.
  Also consider improving drainage (more perlite in the mix, or a better-draining pot).
• Signs of underwatering: On the flip side, a thirsty citronella plant will let you know by wilting or drooping leaves​.
  The leaves may also feel dry or develop crispy brown edges if the plant has been too dry for too long​
  If you see it wilting and the soil is bone dry, water it promptly – it should perk back up within a day.
  Consistent under-watering can stress the plant, so try not to let it completely dry to the point of severe wilt regularly. An occasional wilt is okay (citronella can bounce back), but repeated stress will weaken it.
• Seasonal adjustments: Adjust your watering frequency with the seasons. In winter months, indoor citronella plants grow more slowly due to lower light, so they use water more slowly.
  You might find you only need to water every 2 weeks or so in winter. Always test the soil; do not overwater in the slow-growth period​.
  In summer, with stronger sun and maybe if you move the plant outdoors, you’ll water more often. The key is responsiveness – water when needed, rather than on a fixed schedule.

By following these guidelines – water thoroughly, then wait for partial drying – you’ll keep your citronella’s roots healthy. Remember: when in doubt, it’s safer to underwater than overwater for this plant. 

It can recover from a bit of drought, but it may not recover from root rot. So lean toward caution, and your watering schedule will soon become second nature.

 

Soil Type

Providing the right soil mix is another essential part of citronella plant care. In nature (and outdoors), geraniums like these prefer a loose, well-draining soil, and we should mimic that in the pot. Here’s what to know about soil for indoor citronella plants:

• Well-Draining Potting Mix:
  Use a high-quality general purpose potting soil that is known for good drainage. You might look for mixes labeled for houseplants, herbs, or even cactus mixes can work if amended.
  The soil should hold some moisture but drain quickly after watering​.
  A mix that stays soggy is not suitable. You can improve drainage by adding a handful of perlite, coarse sand, or pine bark to the mix to increase air pockets.
• Light and Loamy.
  Citronella plants enjoy a somewhat loamy soil – one that has a balance of organic material and grit. For example, a mix of 2 parts regular potting soil, 1 part perlite, and 1 part peat moss or coco coir can create a nice texture.
  The peat/coir provides organic matter and a bit of water retention, while perlite ensures excess water escapes easily. The goal is a soil that stays moist but not waterlogged after watering.
• Avoid Heavy Soil:
  Don’t use heavy garden soil or straight clay in your pot. Heavy soils compact and hold too much water in containers, leading to poor root health.
  Also avoid soils high in moisture-retaining crystals – those are great for some moisture-loving plants, but not necessary for citronella geraniums, which prefer it a bit drier between waterings.
• PH Level:
  These plants aren’t too fussy about soil pH, but they do best in slightly acidic to neutral soil (around pH 6.0–7.0)​.
  Most standard potting soils fall in this range, so you usually don’t need to modify pH. If you’re using a lot of compost or garden soil, just ensure it’s not extremely alkaline. Generally, if other houseplants are happy in the mix, the citronella will be too.
• Refreshing Soil:
  It’s a good idea to repot with fresh soil every couple of years. Over time, soil can become compacted or depleted of nutrients. When repotting (typically in spring), gently shake off some of the old soil and replace with a fresh mix.
  This gives the plant a nutrient boost and improves aeration around the roots. Choose a pot only 1–2 inches larger in diameter, since too large a pot with excess soil can hold extra water.
• Container and Drainage:
  As mentioned in watering, the pot must have drainage holes to let water out of the soil.
  You can put a coffee filter or piece of mesh over the holes when potting to prevent soil from washing out, but don’t put rocks at the bottom – contrary to old myths, a layer of rocks doesn’t improve drainage in a pot, it actually creates a perched water table.
  It’s best to use all soil and let gravity do the work through the holes.

Using the right soil ensures your citronella plant’s roots have both the moisture and oxygen they need. 

A well-draining mix will drastically reduce the chances of root rot while still giving the roots access to water between waterings. Pair good soil with proper watering habits, and your citronella will develop a strong root system to support lush growth above.

 

Temperature and Humidity

The citronella plant prefers a warm, mild climate, which is why it’s so well-suited to indoor life in most homes. Getting the temperature and humidity right will help your citronella geranium thrive and prevent stress.

 

Temperature

Keep your indoor citronella plant in the range of 65–75°F (18–24°C) for optimal growth​. This conveniently aligns with typical room temperatures. 

During the day, temperatures in the 70s°F are fine, and at night it can drop to the 60s without issue. The key is to avoid cold extremes. Temperatures consistently below about 50°F (10°C) can harm the plant​, causing leaves to yellow or drop. 

For this reason, if you move the plant outdoors in summer, be sure to bring it back inside well before the first frost. In fact, many gardeners will bring their citronella plant indoors once night temperatures dip into the low 60s°F, just to be safe​.

Indoors, keep the plant away from cold drafts such as an AC vent blasting directly on it, or a door that opens to winter air. 

Likewise, don’t let the foliage touch a freezing cold windowpane in winter – that can chill or even freeze the leaves. 

If you’re overwintering your citronella in a cool room (say a sunroom that gets into the 50s°F at night), it may go semi-dormant and not do much until it warms up again, which is okay as long as it doesn’t freeze. But generally, normal household warmth is perfect.

 

Humidity 

Citronella plants are native to somewhat humid environments (tropical/subtropical regions), but they are fairly adaptable to typical indoor humidity levels. Average home humidity of around 40-50% RH (relative humidity) works well​.

If your home is very dry, you may see some minor issues like browning leaf edges, but the plant usually tolerates low humidity better than many tropical houseplants. Here are some humidity tips:

• Average is fine: Most homes naturally sit in the 30-50% humidity range, which the citronella geranium can handle. It doesn’t usually require a humidifier or special measures unless your air is extremely dry.
• Dry air signs: If humidity drops too low (e.g., heated homes in winter can plunge below 20% RH), you might notice brown, crispy tips on the leaves​.
  If that happens, there are a few easy fixes: you can run a humidifier in the room to bump up moisture, or place the pot on a pebble tray (a shallow tray filled with water and pebbles, where the pot sits on the pebbles, not directly in water) which increases local humidity as the water evaporates​.
  Even grouping your citronella with other houseplants can create a slightly more humid microclimate around them.
• Too humid? On the flip side, while they like some moisture in the air, avoid extremely stagnant humidity with no airflow, as that can encourage fungal diseases on leaves. Indoors this is rarely a problem if your space has any air circulation.
  Just don’t enclose the plant in a perpetually wet terrarium or plastic wrap – it likes to breathe.
• Bathrooms & kitchens: Because they tend to have higher humidity, a bright bathroom or kitchen window can be an excellent spot for a citronella plant​.
  Just ensure the light is strong enough. A south-facing kitchen window, for example, provides both the sun and a bit of humidity from cooking or the sink.

In summary, keep it warm and moderately moist. Typical room conditions suit the citronella plant perfectly. As long as you prevent cold shocks and remedy extremely dry air, your indoor temperature and humidity will keep this plant comfortable year-round. 

If you do need to bring it in from outside, remember to acclimate it (sudden changes in temperature/humidity can stress the plant – more on that in the Overwintering tips later). 

But in steady indoor conditions, temperature and humidity should be one of the easier parts of citronella plant care.

 

Fertilizer Needs

The citronella plant (scented geranium) is not a particularly heavy feeder, but it does benefit from a little nutritional boost during its active growing season. 

Fertilizing correctly will encourage healthy leaf growth and overall vigor, but over-fertilizing can do more harm than good. Here’s how to feed your indoor citronella plant:

• When to Fertilize.
  Focus on feeding the plant during spring and summer, when it’s actively growing new leaves and possibly flowering. In these warmer, brighter months the plant uses more nutrients. Feed about once a month or once every 4-6 weeks in spring/summer​.
  In contrast, do not fertilize (or fertilize very sparingly) in fall and winter. During the cooler, darker months the plant’s growth slows down, and it won’t use much fertilizer.
  Feeding in winter can lead to a buildup of unused salts in the soil, which can harm the roots.
• Type of Fertilizer.
  Use a balanced, water-soluble houseplant fertilizer. Something with an N-P-K ratio roughly around 10-10-10 or 20-20-20 (diluted) is suitable​.
  You don’t need anything high in one particular nutrient; balanced is best for overall foliage health. Alternatively, an all-purpose organic fertilizer like a fish emulsion or seaweed blend will work well​.
  Organic options release nutrients more slowly and gently, which matches the citronella’s modest needs.
• How to Apply.
  Always dilute the fertilizer to half or quarter strength of what the label recommends for outdoor plants. For example, if the label says 1 teaspoon per gallon, you can use 1/2 teaspoon per gallon for your potted citronella.
  Apply the fertilizer solution to moist soil (don’t fertilize when the soil is bone dry, as it can burn the roots).
  You can water with the fertilizer solution as you would a normal watering, allowing excess to drain. Be careful not to overdo it – more is not better with fertilizer. Under-fertilizing is safer than over-fertilizing.
• Slow-Release Option.
  If you prefer a low-maintenance approach, you can mix a slow-release granular fertilizer into the potting soil at the start of the growing season​.
  Many slow-release fertilizers feed for about 3 months. This way, each time you water, a small amount of nutrients is released to the plant.
  Just be cautious not to reapply slow-release granules too often; follow product guidance, as some might continue releasing into fall.
• Signs of Nutrient Needs.
  If your plant’s older leaves are uniformly yellowing and it’s not a watering issue, it could be a mild nutrient deficiency.
  Likewise, very slow, stunted growth during the growing season might indicate the plant is hungry. In these cases, a light feeding can help.
  However, don’t expect or try to force super-fast growth – citronella plants naturally aren’t rapid growers indoors. A little fertilizer simply ensures they have the resources to produce lush foliage.
• Avoid Over-Fertilizing.
  Too much fertilizer can cause problems such as brown leaf tips or edges (from fertilizer burn or salt buildup) and excessively soft, leggy growth.
  Overfeeding can also reduce the concentration of the fragrant oils in the leaves. It’s often said with herbs and scented plants: a lean diet can produce more intense aroma, whereas too much fertilizer may cause lots of lush growth with less scent.
  So, keep the feedings light and infrequent.

In summary, feed your indoor citronella sparingly and only in the growing season. A diluted, balanced fertilizer every month or so in spring and summer will keep the plant healthy. 

Always water well after fertilizing to distribute nutrients and avoid any root burn. By giving just the right amount of food, you’ll have a vigorous citronella plant without any risk of overloading it. 

Remember, this plant’s needs are modest – sometimes just repotting into fresh soil (which contains slow-release nutrients) is enough for a season. Monitor your plant’s response and adjust feeding if necessary.

 

Common Problems and Solutions

Even with the best care, you might encounter some hiccups with your indoor citronella plant. Don’t worry – most issues have simple fixes. Here are some common problems you might see, along with their causes and solutions:

• Leggy, floppy growth.
  If your citronella plant has long, stretched-out stems with sparse leaves, it’s getting insufficient light. This “leggy” appearance is a classic sign of the plant stretching for more sun​.
  
  Solution: Move it to a brighter location where it receives several hours of direct sunlight​. You should also prune back the elongated stems to encourage new, bushier growth​. Going forward, consistent bright light will keep it from getting leggy again.
• Yellowing leaves.
  There are a few reasons leaves might turn yellow. The most common is overwatering – if too much water has been given, the roots can’t get oxygen and leaves (often the lower ones first) will yellow and drop​.
  Another reason could be a nitrogen deficiency if the plant hasn’t been fed in a long time (uniform yellow on older leaves).
  
  Solution: If the soil is chronically wet, let it dry out and adjust your watering schedule (see Watering Schedule above).
  Ensure the pot drains well. If you suspect nutrient deficiency, a light feeding can help green up new growth.
  Also check for pests on yellowing leaves – sometimes sap-sucking insects like aphids cause discoloration (inspect under leaves for bugs just in case)​.
• Wilting or drooping.
  Your plant’s leaves or stems may wilt for opposite reasons: either too dry or too wet. If the soil is bone dry and the plant is limp, it’s thirsty – water it, and it should perk up within a day​.
  If the soil is wet and yet the plant is wilted, you likely have root rot from overwatering – the damaged roots can’t take up water, so the plant wilts as if dry (this is more serious).
  
  Solution: For underwatering, hydrate the plant and consider watering a bit more frequently.
  For overwatering/root rot, you’ll need to unpot the plant, trim away any mushy rotten roots, and replant in fresh, dry soil. Going forward, water less often and make sure drainage is excellent.
• Brown, crispy leaf edges.
  When leaf edges or tips turn brown and brittle, low humidity or underwatering is often to blame​. It could also be salt buildup from too much fertilizer.
  
  Solution: Increase humidity around the plant (use a pebble tray or humidifier as discussed in Temperature and Humidity) if your environment is very dry.
  Also ensure you’re watering enough – don’t let the plant completely dry out too often. Leach the soil occasionally by watering heavily to flush out any accumulated salts.
  Trim off the unsightly brown tips if desired; new growth should be healthy if the cause is corrected.
• No scent unless touched.
  Some new growers are concerned that they don’t smell the citronella aroma. This is actually normal – the plant doesn’t release its fragrance constantly into the air at a strong level.
  
  Solution: Gently rub or squeeze a leaf between your fingers to bruise it; this releases the oils and you’ll get that lovely citronella scent.
  Placing the plant where you might brush against it occasionally (like near a doorway or seating area) can also help release fragrance. Just remember it’s not an air freshener by itself; you have to activate the scent by touching the leaves​.
• Pest infestations.
  Indoors, citronella plants can sometimes attract common houseplant pests. You might encounter aphids, whiteflies, or spider mites, for example. Aphids are tiny green or black soft-bodied insects often clustered on new growth; they cause distorted, sticky leaves​. Whiteflies are tiny white flying insects that will flutter up if the plant is disturbed. Spider mites are super small (often you notice their fine webbing and tiny specks on leaves).
  
  Solution: For any pests, start by giving the plant a thorough rinse – you can take it to the sink or shower and gently wash the leaves (top and bottom) to dislodge many insects.
  Follow up with an application of insecticidal soap or neem oil, coating the foliage (especially undersides of leaves) to kill remaining pests​.
  Repeat treatment every 5-7 days for a couple of weeks to catch any stragglers or newly hatched eggs. Also, isolate the infested plant from your other houseplants until the problem is resolved, so the bugs don’t spread.
• Fungal leaf spots or powdery mildew.
  In conditions that are too damp or with poor air circulation, you might see fungal issues like spots on leaves or a white powdery coating.
  
  Solution: Remove any affected leaves, and make sure the plant has good airflow (don’t crowd it among others). Avoid getting water on the leaves routinely – water the soil, not the foliage, to prevent fungus.
  If needed, use a gentle fungicide or a homemade remedy (like a milk-water spray for powdery mildew). Improving light and airflow usually keeps fungal problems at bay.
• Dropping leaves after moving indoors.
  If you transitioned your citronella plant from outdoors to indoors, it might respond by dropping some leaves. This is often due to shock or acclimation to different light/humidity.
  
  Solution: Be patient and continue proper care. Make sure it’s getting as much light as possible in its new spot. In the future, try to acclimate the plant gradually:
  Before the final move inside, keep it for a week or two in a shaded outdoor spot or a porch (to get used to lower light), and check it carefully for pests before bringing it in. Once indoors, some leaf drop is normal, but it should stabilize and produce new leaves adapted to inside conditions.

Most issues with the citronella plant are easily corrected once you identify the cause. The plant is relatively hardy and forgiving. 

By keeping an eye out for early signs of stress (yellow leaves, odd spots, unwelcome bugs) you can intervene quickly and keep your mosquito plant in top shape.

 Remember, prevention is best: proper light, not overwatering, occasional inspection – these practices will prevent many common problems from ever getting a foothold.

 

Pruning and Maintenance

Regular pruning and basic maintenance will keep your citronella plant looking its best and encourage healthy, bushy growth. Don’t be afraid to trim this plant – it actually benefits from a good haircut now and then. Here’s how to maintain your indoor citronella:

• Prune for bushiness: Citronella geraniums have a tendency to become woody or leggy over time if not pruned. Frequent pinching or trimming of the stem tips will encourage the plant to branch out and become more full​.
  Whenever you notice a stem getting too long or sparse, use clean scissors or pruning shears to cut it back by about one-third or to the desired height.
  Make your cut just above a leaf node (the place where a leaf is attached to the stem) – this is where new shoots will emerge, resulting in a bushier plant.
• Timing of pruning: Light pruning (pinching off the soft growing tips) can be done anytime during the active growth period.
  For more significant pruning or shaping, the best time is spring, at the start of the growing season. A spring trim will stimulate lots of fresh growth as the plant ramps up for summer​.
  If your plant has grown large over summer (especially if it was outdoors), you may also prune it back when bringing it indoors for winter to reduce its size and help it fit your space.
  Avoid heavy pruning in late fall or winter, as the plant might be stressed from lower light – you don’t want to remove too much when it’s not actively growing.
• How much to prune: As a general rule, never remove more than 1/3 of the plant’s total foliage at one time. If it’s very overgrown and you need to cut back more, do it in stages (one third now, and another third a few weeks later) to avoid shocking the plant.
  That said, citronella geraniums respond well even to hard pruning – they can often bounce back from a severe cutback if healthy. But for beginners, gradual pruning is safer.
• Remove dead material.
  Regularly remove any yellowing or dead leaves from the plant​. This not only makes it look tidier, but also prevents decay that could attract pests or disease.
  Similarly, if a stem has died back or turned woody and bare, you can trim it off. Use clean tools to avoid introducing infection (wiping the scissors with rubbing alcohol before pruning is a good practice).
• Deadhead flowers.
  If your citronella plant produces small flowers (some varieties do, usually pink-purple in summer), you can pinch off the spent blooms once they fade.
  Deadheading the flowers will direct the plant’s energy back into its foliage (which is what we mainly grow it for) instead of seed production. Plus, it keeps the plant looking neat.
• Cleaning the leaves.
  As part of maintenance, remember to dust off the leaves periodically (every few weeks). Indoor plants can accumulate dust, which can block light and sometimes clog the pores on leaves.
  A quick wipe with a damp cloth, or a gentle rinse in the shower, will keep foliage clean and able to photosynthesize efficiently​. Just be sure to let the plant dry in a warm spot afterward to avoid lingering moisture on leaves.
• Rotate the plant.
  We mentioned this in the Light section, but it’s worth reiterating as maintenance: rotate the pot every week or two.
  This prevents the plant from leaning towards the light and helps it grow evenly on all sides.
• Repotting.
  Citronella plants don’t mind being a bit pot-bound, but about every 2 years you should check if it needs repotting.
  If you see roots heavily matted at the bottom or circling the pot, or if the soil seems to dry out very quickly after watering (a sign the roots have filled the pot), it’s time to repot. Choose a pot just one size up.
  Spring is the best time to repot, just as new growth begins​. After repotting, hold off on fertilizing for a month since fresh potting mix often has nutrients.
• Overwintering tip: If your citronella plant spends summers outside, inspect it thoroughly before bringing it back in for pests or diseases.
  You might even hose it down and repot in fresh soil to avoid bringing in hitchhikers. Also consider pruning it moderately to remove any leggy growth and to make it a more manageable indoor size.
  Acclimate it to indoor conditions by keeping it in a bright, slightly cool area initially (like a porch) before transitioning to indoor temperatures.

By staying on top of pruning and basic care, you’ll keep your citronella plant compact, lush, and vigorous. Regular trims not only improve its shape but also stimulate new scented foliage.
Plus, you can use those pruned cuttings to propagate new plants (as we’ll cover next). In short, don’t neglect the grooming – a well-maintained citronella is a happy citronella!

 

Propagation Methods

One of the fun aspects of growing citronella plants is that they are easy to propagate. You can create new baby plants from an existing one, either to have more for yourself or to share with friends. 

The most common propagation method for Pelargonium citrosum is by stem cuttings, which can be rooted in soil or water. Here’s how to propagate your indoor citronella plant step by step:

 

1. Propagation by Stem Cuttings (in Soil):

Taking cuttings is straightforward and usually very successful. Spring or early summer is the best time to take cuttings, when the plant is in active growth mode​.

• Step 1: Select a cutting:
  Choose a healthy, non-flowering stem from your citronella plant. It should be a relatively young shoot (older woody stems root less readily) that’s about 3 to 5 inches long​.
  Using clean, sharp scissors or pruning shears, cut the stem just below a leaf node (the point where a leaf attaches). A cutting with 2-3 leaf nodes is ideal.
• Step 2: Prepare the cutting:
  Remove the lower leaves from the bottom half of the cutting, leaving a couple of leaves at the top​.
  If the remaining leaves are large, you can cut them in half to reduce water loss – the cutting has no roots yet, so less foliage means it won’t dry out as easily. You can also remove any small stems or buds on the portion of the cutting that will be in soil.
• Step 3: (Optional) Dip in rooting hormone:
  Although not strictly necessary, dipping the cut end in rooting hormone powder or gel can boost success rates and speed up rooting​.
  Rooting hormone contains auxins that encourage root cells to develop. If you have it on hand, lightly coat the bottom 1 inch of the cutting with the hormone, tapping off any excess.
• Step 4: Plant the cutting:
  Fill a small pot (or even a plastic nursery six-pack or tray) with a moist, well-draining propagation mix.
  You can use a mix of half peat moss (or coco coir) and half perlite, or regular potting soil mixed 1:1 with perlite – the key is that it’s light and drains well while holding some moisture.
  Using a pencil or your finger, poke a hole in the soil and insert the cutting about 1-2 inches deep (enough to bury at least one node under the soil). Firm the soil gently around it so the cutting stands upright​.

• Step 5: Create a humid environment:
  Cuttings root best with some humidity around them. You can cover the pot loosely with a clear plastic bag to trap humidity (make sure the bag doesn’t press on the leaves – a couple of sticks can prop it up like a tent).
  Alternatively, mist the cutting periodically.
  Place the potted cutting in a warm, bright spot with indirect light – avoid harsh direct sun at this stage, which can dry it out​. Aim for a temperature around 70–75°F if possible, which encourages rooting.
• Step 6: Keep soil slightly moist:
  Over the next few weeks, check the soil moisture often. It should stay slightly moist but never waterlogged.
  Water lightly as needed to keep the medium damp like a wrung sponge. Every few days, you can mist the leaves to maintain humidity​. (if you have the plastic cover on, you might not need to mist much).
  Good airflow is also important to prevent rot, so if using a cover, take it off for a short while each day to let things breathe.
• Step 7: Check for roots:
  After about 4 to 6 weeks, your cutting should be developing roots​. You can gently tug on it – if you feel resistance, it has rooted.
  Or carefully tip the pot to see if roots are visible at the drainage holes or along the sides. New leaf growth on the cutting is also a sign that roots have formed (since the cutting can’t support new growth without roots).
• Step 8: Pot it up:
  Once rooted, transplant the new citronella plant into a slightly larger pot with regular potting soil. Treat it gently – the new roots are delicate. Water it and begin caring for it as you would a mature plant. Keep it in bright light (you can introduce it gradually to more direct sun now).

 

2. Propagation by Stem Cuttings (in Water):

Citronella geranium cuttings can also be rooted in water, which is a fun way to watch the roots grow. The initial steps (selecting and preparing a cutting) are the same as above, minus the rooting hormone.

• Step 1: Take a similar cutting (4–6 inches, remove lower leaves). Instead of planting in soil, simply place the cutting in a jar or glass of water​.
  Make sure that at least one or two nodes are submerged in the water, because roots will emerge from the nodes​.
  But also ensure no leaves are sitting in the water (they will rot). If needed, remove leaves that would be underwater.
• Step 2: Use clean, room-temperature water, ideally filtered or tap water that has sat out overnight (to let chlorine dissipate). Only a few inches of water is needed in the container.
• Step 3: Put the jar with the cutting in a bright spot with indirect light (for instance, near a window but not in the intense sunbeam)​. Too much direct sun can cause algae growth in the water and might overheat the cutting.
• Step 4: Change the water every 3–5 days​  to keep it fresh and oxygenated. Top up the water if it evaporates, so the nodes stay submerged.
  Clear containers are fine, but some people root cuttings in dark or opaque containers, claiming roots form faster without light – you could experiment, but it generally isn’t a big issue for geraniums.
• Step 5: After a couple of weeks, start watching for root development. You’ll see slender white roots emerging from the nodes. Be patient – it might take around 4–6 weeks to get a nice set of roots about a few inches long​.
• Step 6: Once the roots are a few inches long, it’s time to transfer the cutting to soil​. Prepare a small pot with moist potting mix.
  Make a hole and very carefully plant the rooted cutting, gently firming soil around the new roots. Water it lightly.
  At first, the cutting may wilt a bit as it adjusts from water to soil (those water roots need to get used to drawing moisture from soil).
  To ease the transition, you can keep the humidity high around it for a week or two (mist it or cover loosely as you did with direct soil cuttings).
• Step 7: Resume normal care. Give it bright light and keep the soil slightly moist (don’t let it dry out completely until you see new growth, which indicates it’s established). Soon it will start growing new leaves and behaving like a normal plant.

Water propagation can be slightly less reliable for some woody geranium stems compared to soil, but it’s certainly doable and quite satisfying to see roots form.
If one method doesn’t work for you, try the other – or even try layering, another method:

 

3. Propagation by Layering (advanced, optional):

Layering is useful if you have a big citronella plant and want to root a section of it before detaching it. Outdoors, gardeners do this by pinning a branch to the soil to let it root. Indoors, you can simulate this with an adjacent pot:

• Take a long, flexible stem from the mother plant and bend it down toward another pot filled with soil, placed next to the mother plant’s pot​.
• Strip a couple of leaves off a section of that stem (to expose nodes), and bury that section in the soil of the adjacent pot (use a U-shaped pin or even a bent paperclip to hold it under the soil). Leave the growing tip of the stem exposed above the soil, still attached to the mother plant​.
• Keep that soil moist for a few weeks. The buried node should start forming roots while still nourished by the mother plant.
• After about 3–6 weeks, tug gently or check if roots have formed in the new pot (you might see new growth as a sign too). Then you can cut the connecting stem from the mother plant, separating the new plant which is already rooted in its own pot​.

Layering is a bit more fiddly indoors, but it can be a nearly foolproof way to get a clone of your plant. 

It’s especially handy at the end of summer if your outdoor citronella is huge – rather than potting the whole big plant, you could layer a stem into a small pot and then bring that rooted cutting inside, which is more space-efficient.

Seeds: Growing citronella plants from seed is possible but not very common, mainly because the plants you buy are usually hybrids or specific cultivars (like Pelargonium citrosum ‘Van Leenii’) that may not come true from seed​. 

If you do have seeds, you can start them indoors in early spring in seedling trays with a light, moist seed-starting mix. Provide warmth (~70°F) and bright light. Seeds could take a couple of weeks to germinate. 

However, propagation by cuttings is so easy and yields identical plants to the parent, so it’s often the preferred method.

No matter which propagation route you choose, you’ll soon have more citronella plants on your hands! These can make great gifts – potted up with a cute label as a natural mosquito plant for friends’ patios (with the caveat about the myth). 

Plus, keeping a few propagated backups ensures you’ll always have a healthy plant even if one runs into issues. Enjoy experimenting with propagation – it’s a wonderful part of indoor gardening.

 

Frequently Asked Questions (FAQs)

Q: Can citronella plants grow indoors all year round?
A: Yes, the citronella (scented geranium) can be grown as a year-round houseplant. In fact, it must be grown indoors year-round in any climate that gets frost, since it’s not frost-hardy​. 

As long as you provide adequate light, water, and temperatures above 50°F (10°C), your citronella plant can live and thrive indoors throughout all seasons. Many people keep them as permanent potted houseplants or bring them inside each winter.

Q: Does the indoor citronella plant actually repel mosquitoes or insects?
A: Not significantly by itself. The citronella plant is often marketed as a “mosquito plant,” but its insect-repelling effect is minimal unless you release the oils by crushing the leaves​. Merely having the plant in the room won’t ward off mosquitoes. 

The citrusy scent is pleasant to our noses, but to get any repellent benefit you’d need to rub the leaves on your skin or set crushed leaves around – even then, it’s not as effective as true citronella oil from citronella grass. 

So enjoy this plant for its fragrance and beauty, but don’t rely on it as your mosquito control method.

Q: How often should I water my indoor citronella plant?
A: Water when the top 1 inch of soil is dry, which typically means every 7–10 days in most home environments. 

There’s no fixed schedule because it depends on factors like pot size, temperature, and humidity. In a warm bright spot, you might water weekly; in a cooler or lower-light setting, maybe every two weeks. 

Always check the soil dryness with your finger. It’s crucial not to overwater – when in doubt, wait a couple more days. Remember that consistent overwatering can cause root rot and yellow leaves​, so err on the side of slightly dry rather than soggy.

Q: My citronella plant is looking leggy and floppy. What can I do to fix it?
A: Leggy growth means your plant needs more light. Move it to the sunniest location you have – ideally a window with some direct sun daily​. 

Then, prune back the stretched stems to just above a leaf node to encourage new branches​. Within a few weeks, you should see bushier growth if the light is improved. 

Regular pinching of new growth tips will also help keep it compact. Basically, more sun + a trim = a fuller, sturdier citronella plant.

Q: What temperatures can a citronella plant tolerate?
A: Indoors it prefers typical room temperatures (65–75°F). It can handle short bursts outside that range, but you should keep it above 50°F (10°C) at all times​. 

If you put it outdoors for summer, bring it in once nights start getting into the mid-50s°F. It doesn’t like cold drafts or sudden temperature drops. 

On the higher end, it can take summer heat (even 85–90°F) as long as it’s watered; just avoid baking it in extreme heat without water. Consistency is best – so avoid very cold window sills in winter nights, etc.

Q: Do I need to mist my citronella plant or give it extra humidity?
A: In most cases, no extra misting is required. Citronella plants do fine in normal household humidity (~40%). 

If your home’s air is very dry (especially with winter heating), occasional misting or a pebble tray can help prevent leaf browning​, but they are not as fussy as some tropical houseplants. 

If you enjoy misting and the plant is healthy, it won’t hurt – just do it in the morning so leaves dry by evening to avoid any fungal issues. Ensure the plant still gets good airflow.

Q: What kind of fertilizer is best, and how often should I fertilize?
A: Use any balanced all-purpose houseplant fertilizer diluted to half-strength. A formulation around 10-10-10 NPK works well​. Feed about once a month during spring and summer when the plant is actively growing​. 

There’s no need to fertilize in the fall and winter dormancy period. Always apply fertilizer to moist soil (never bone dry) and do not overfeed – too much fertilizer can burn the plant’s roots or cause lanky growth. When in doubt, less is more with feeding.

 

Q: Is the citronella plant toxic to pets or children?
A: Yes, caution is advised. Scented geraniums like the citronella plant are considered mildly toxic to dogs and cats if ingested​. 

They contain compounds (like geraniol and linalool) that can cause gastrointestinal upset, vomiting, or skin irritation. Most pets will leave strongly scented leaves alone, but curious chewers should be kept away. 

It’s a good idea to place the plant out of reach of pets and toddlers. If a lot of the plant is ingested, consult a veterinarian or doctor for advice. On the plus side, deer and rabbits seem to dislike the smell of these plants in garden settings, but that’s rarely an issue indoors!

Q: Why are the leaves of my citronella plant turning yellow and dropping?
A: Yellow leaves that drop can result from a few things. The most likely cause is overwatering and poor drainage – the roots sitting in water lead to leaf yellowing​.

Make sure you let the soil dry a bit between waterings and that excess water can escape the pot. Another cause could be a sudden change in environment (like moving the plant) causing some older leaves to shed. 

Nutrient deficiencies can cause yellowing too, but that’s less common indoors if you occasionally fertilize. 

Check also for pest infestation on those leaves (tiny bugs can weaken leaves and cause yellowing). 

Once you identify and fix the cause (water, light, nutrients, or pests), new growth should stay green.

Q: Can I put my indoor citronella plant outside in summer?
A: Absolutely! Citronella plants love being outdoors in warm weather. Once temperatures are consistently above 60°F, you can transition your potted plant outside. 

Introduce it gradually to the higher light levels outdoors (start in a shaded or part-sun spot for a few days, then move to full sun) to avoid sunburn on the leaves. 

Outdoors, it may thrive with bushier growth thanks to the abundant light. Just remember to bring it back indoors before the autumn cold sets in, ideally when nights start falling below ~55°F​. 

Also, check for pests on the plant before bringing it inside for winter. Many indoor growers give their citronella a summer vacation outdoors and then enjoy it inside during winter.

 

Conclusion

Caring for a citronella plant indoors is a straightforward and satisfying endeavor. This resilient scented geranium will reward you with lush greenery and a delightful lemony aroma if you provide it with the key essentials: plenty of light, moderate watering, well-draining soil, and occasional TLC in the form of pruning and feeding. 

By following the tips in this guide, you’re well on your way to cultivating a healthy citronella plant that thrives in your home.

Remember, even if you’re a beginner, the citronella plant (or “mosquito plant”) is forgiving and easy to work with. Pay attention to its light and water needs – those are the big ones – and don’t hesitate to prune it to keep it in shape. 

Soon enough, you’ll have a beautiful, bushy citronella gracing your windowsill or indoor garden.

Now it’s time to put this knowledge into practice: find a sunny spot, check that soil, give your citronella some love, and watch it grow! 

With consistent care, your indoor citronella plant will continue to flourish, providing you with a touch of green, a whiff of citrus, and the satisfaction of a successfully tended houseplant. Happy gardening