A citronella plant brings feathery green foliage, a bright lemony scent, and an easygoing cottage-garden look to patios, borders, and sunny windows. Brush a leaf while walking past and the fragrance appears instantlyfar more charming than discovering you have been brushing against a spiderweb.
The plant most garden centers sell as “citronella plant” or “mosquito plant” is usually a scented geranium in the genus Pelargonium, often labeled Pelargonium citrosum or Pelargonium ‘Citrosum.’ It is different from true citronella grass, the tropical Cymbopogon used to produce citronella oil. This guide focuses on the popular scented geranium while explaining the differences where they matter.
Citronella Plant vs. True Citronella Grass
Citronella-scented geranium has branching stems, broad lobed leaves, and small pink or lavender flowers. It develops into a rounded, shrubby plant that fits comfortably in a patio container.
True citronella grass, mainly Cymbopogon nardus and Cymbopogon winterianus, has long, narrow blades and forms a large tropical clump. It needs more room, warmth, water, and a much larger pot. Always check the botanical name instead of trusting a common label that may be doing several jobs at once.
Citronella Plant Care at a Glance
- Light: Six or more hours of sun; provide afternoon shade in extreme heat
- Soil: Fertile, loose, and fast-draining
- Water: Soak thoroughly when the top inch of soil feels dry
- Temperature: Warm conditions with protection from frost
- Fertilizer: Light feeding during spring and summer
- Pruning: Pinch growing tips regularly for a fuller plant
- Best use: Containers, raised beds, borders, and bright indoor windows
How to Plant Citronella
Choose the Right Time
Plant outdoors after the danger of frost has passed and nighttime temperatures are reliably mild. In cold climates, grow citronella as an annual or keep it in a container that can move indoors before fall frost.
Harden off greenhouse-grown plants for about a week. Begin with a few hours of gentle outdoor light, then gradually increase sun and wind exposure. Moving a tender plant directly into all-day sun can cause bleached, crispy leaves and an impressive amount of gardener guilt.
Pick a Sunny, Well-Drained Site
Choose a place receiving at least six hours of direct light. Morning sun is ideal, while light afternoon shade helps in very hot Southern and Southwestern gardens. Too much shade produces long stems, wide gaps between leaves, and weak growth.
Drainage is essential. Citronella geranium handles brief dryness better than roots that remain wet for days. In heavy clay or low spots, use a raised bed or container rather than trying to convince waterlogged soil to become something it is not.
Prepare the Soil
Use a quality container mix amended with perlite, pumice, or fine pine bark. In garden beds, loosen compacted soil and add compost to improve structure without creating a soggy planting pocket.
Set the plant at the same depth it grew in its nursery pot. Burying the crown or lower stems can encourage rot. Space plants about 18 to 24 inches apart so air can circulate and the branches have room to spread.
Light and Temperature Requirements
Strong light keeps citronella compact and fragrant. Outdoors, aim for six or more hours of sun. Indoors, place the pot near a bright south- or west-facing window and rotate it weekly so one side does not lean toward the glass. A grow light can help during dark winters.
Citronella-scented geranium is frost-tender. Move containers indoors before the first frost. Avoid cold drafts, heating vents, and sudden changes in exposure. Some leaf drop is normal when an outdoor plant adjusts to lower indoor light.
How to Water Citronella Correctly
Check the soil rather than watering by the calendar. When the upper inch feels dry, soak the root ball until water exits the drainage holes. Empty saucers and decorative outer pots so the roots never sit in standing water.
Containers may need frequent watering in hot, windy weather, while indoor plants need much less during winter. Yellow lower leaves, soft stems, sour-smelling soil, and wilting despite wet soil can indicate overwatering or root rot. Crispy edges and limp foliage in dry soil usually mean the plant waited too long for a drink.
Water at soil level when possible. Constantly wet leaves, crowded branches, and poor airflow increase the risk of leaf spots and stem disease.
Fertilizing and Pruning
Feed Lightly
Citronella geranium is not a heavy feeder. Apply a balanced liquid fertilizer at half strength every four to six weeks during active spring and summer growth, following the product label. Reduce or stop feeding in fall and winter.
Excess nitrogen creates soft, lanky stems and fewer flowers. If the plant grows rapidly but looks loose and floppy, more fertilizer is probably not the answer.
Pinch for Bushier Growth
Pinch the soft tips of young stems to encourage side branches. If an older plant becomes leggy, shorten long stems by up to one-third, cutting just above a leaf node. Remove yellow leaves, damaged growth, and faded flower clusters with clean tools.
Regular pruning improves airflow and produces more of the scented foliage that makes the plant enjoyable. It also provides healthy material for propagation.
Growing Citronella in Containers
A pot is the easiest choice for gardeners who experience frost. Start a young plant in a container about 10 to 12 inches wide. Move it up one size when roots circle the pot or the mix dries unusually fast. Every container needs drainage holes; rocks placed beneath the soil do not replace them.
Terracotta dries quickly and suits rainy climates or enthusiastic waterers. Glazed ceramic and plastic retain moisture longer, which helps in hot, dry regions. Repot in spring with fresh mix, but avoid an oversized pot because unused soil stays wet longer.
How to Overwinter Citronella
Before bringing a plant indoors, inspect leaf undersides and stem joints for insects. Rinse the foliage, remove damaged growth, and keep the plant separate from other houseplants briefly while watching for pests.
Place it in the brightest practical location and water only after the upper soil dries. Expect slower growth and some leaf loss. Another option is to take cuttings in late summer and overwinter several compact young plants instead of finding indoor space for one patio-sized parent.
How to Propagate Citronella From Cuttings
- Cut a healthy, nonflowering 3- to 4-inch stem tip just below a node.
- Remove the lower leaves and any flowers or buds.
- Dip the cut end in rooting hormone if desired.
- Insert it into a moist, airy mix such as perlite and peat.
- Keep it in bright, indirect light with the medium lightly moist.
- Pot it separately after roots and fresh growth develop.
A clear cover can reduce moisture loss, but open it regularly for airflow and keep it from touching the leaves. Rooting takes several weeks. Do not tug on the cutting every morning to see whether it has reconsidered its life choices.
Common Citronella Plant Problems
Leggy or Pale Growth
The most common causes are insufficient light, excessive fertilizer, and a lack of pinching. Increase light gradually, prune stretched stems, and reduce feeding.
Yellow Leaves or Soft Stems
Check drainage and soil moisture. Let an overly wet mix dry, remove standing water, and repot if roots are brown, mushy, or foul-smelling. A decorative pot without a hole is home decor, not horticultural equipment.
Aphids, Whiteflies, Spider Mites, and Mealybugs
Inspect plants regularly, especially before moving them indoors. Small infestations may be removed with water or by wiping the leaves and stems. Insecticidal soap can control many soft-bodied pests when applied thoroughly and repeatedly according to its label. Test sprays on a small area first.
Leaf Spots and Rot
Remove affected material, sanitize tools, improve spacing, and correct overwatering. Avoid keeping the leaves wet overnight. A severely collapsed plant may be easier to replace with a healthy rooted cutting.
Does a Citronella Plant Repel Mosquitoes?
A potted citronella-scented geranium does not reliably repel mosquitoes across a patio or yard. The lemon aroma becomes stronger when the foliage is touched or crushed, but scientific evidence does not support using the living plant as meaningful bite protection.
Commercial citronella oil is distilled mainly from tropical Cymbopogon grasses and used at controlled concentrations in formulated products. Do not rub crushed geranium leaves or concentrated essential oil directly onto skin without appropriate safety guidance; natural ingredients can still irritate.
Enjoy citronella for its fragrance and appearance, then use proven mosquito precautions: remove standing water, wear protective clothing, repair screens, and apply an appropriate registered repellent according to its directions.
Pet Safety
Scented geraniums in the genus Pelargonium are considered toxic to dogs and cats if eaten. Possible effects include digestive upset and, with larger exposures, weakness or other symptoms. Keep pots out of reach of plant-chewing pets and contact a veterinarian or animal poison-control service if ingestion occurs.
How to Care for True Citronella Grass
If the plant has long grasslike blades, give it full sun, warm temperatures, rich but well-drained soil, and steadier moisture than a citronella geranium. It grows rapidly in summer and can become several feet tall and wide, so use a large container or spacious garden location.
True citronella grass is also frost-tender. In cold climates, grow it as an annual, divide and pot a manageable section for winter, or move the entire container indoors before frost. Wear gloves when handling mature clumps because the blade edges may feel sharp.
Final Thoughts
Successful citronella plant care comes down to strong light, fast drainage, thoughtful watering, and regular pinching. Add winter protection in cold climates and occasional pest checks, and the scented geranium can remain attractive for years.
It may not patrol the porch like a tiny mosquito security guard, but it offers more dependable rewards: textured foliage, citrus fragrance, easy propagation, and a forgiving personality.
A Season With Citronella: Practical Growing Experience
The following field notes are a composite of common container-growing experiences rather than a claim of personal gardening experience.
The first lesson many growers learn is that a nursery-fresh citronella plant looks tougher than it is. A young specimen may appear ready for full summer sun, but placing it immediately on a scorching patio can bleach the leaves within days. Gradual acclimation works better. A few mornings in gentle light, followed by longer outdoor periods, usually produces a plant that settles in without a theatrical collapse.
Container choice is the next lesson. A beautiful pot without a drainage hole quickly becomes a lemon-scented bog. A 10- to 12-inch container filled with loose potting mix and extra perlite gives a young plant room without surrounding it with too much wet soil. Learning the weight of the pot is useful: a light container often needs water, while a heavy one usually does not.
By early summer, growth can become surprisingly fast. Stems stretch toward the sun, leaves overlap, and one side of the plant may begin winning a race the other side did not know had started. Rotating the pot and pinching the tips keeps the shape balanced. The first cuts can feel counterproductive, but side shoots soon appear below them. Within weeks, the plant looks fuller and produces more fragrant foliage.
Hot afternoons create another common mistake. Citronella may droop temporarily even when the soil is still damp. Watering automatically at every wilt can lead to root trouble. Checking the mix first is safer. Dry upper soil and a light pot justify a deep drink; cool, moist soil suggests heat stress instead. Light afternoon shade often solves the problem better than another watering can.
Pests are most noticeable when the plant moves indoors. Whiteflies may flutter from the leaves, while spider mites leave pale stippling or fine webbing underneath. Washing the foliage, trimming crowded stems, and isolating the plant before placing it beside other houseplants prevents a minor issue from becoming an indoor convention. Follow-up checks matter because one rinse rarely removes every egg.
Propagation is often the most satisfying part of the season. Not every cutting succeeds, and the failures are instructive. Saturated media blackens stems, intense sun dries unrooted cuttings, and flowers consume energy needed for roots. Healthy nonflowering tips placed in lightly moist, airy mix and bright indirect light perform much better. By spring, several young plants may be ready to replace an aging parent or become easy gifts.
The final lesson is expectation management. The foliage smells wonderful when touched, but mosquitoes still arrive. Once the plant is appreciated as a scented geranium rather than a living insect-repellent appliance, it becomes far more enjoyable. Its true strengths are fragrance, fast growth, resilience after pruning, and the small pleasure of brushing a lemon-scented leaf while stepping onto the patio.
Note: Plant labels vary, so confirm the botanical name before planting. Citronella-scented geranium and true citronella grass need different amounts of space and moisture. Keep scented geraniums away from pets that may chew the foliage.
