Can Citronella Grow Indoors? | Why The Geranium Label

The plant in the nursery pot labeled “citronella” is probably not what you expect. Most people picture the tropical grass used to make citronella oil, but the common mosquito plant is actually a scented geranium—Pelargonium citrosum.

That distinction matters when you ask whether citronella can grow indoors. The geranium version adapts beautifully to life inside a home, provided you get the light and watering right. Here’s what it takes to keep yours alive through winter and thriving year-round.

What You’re Actually Buying

True citronella grass (Cymbopogon nardus) is a tropical clumping grass that demands high heat and humidity—conditions most homes can’t provide indoors. The citronella geranium is far more forgiving. It grows as a perennial in warm climates and functions as a decorative houseplant everywhere else.

Start with a pot that drains well and a standard potting mix. Place it near a south- or west-facing window where it gets at least six hours of direct sunlight daily. That strong light keeps the foliage dense and the lemon scent potent.

If you’re moving an outdoor plant inside for winter, do it before the first frost. These plants are not frost-hardy and will die if temperatures dip near freezing. Bring them in early, and they’ll settle in before the real cold hits.

Why The Mosquito Plant Label Sticks

People buy citronella expecting a patio plant that drives mosquitoes away. The lemon scent is real—crush a leaf and you get that familiar note—but the plant itself doesn’t clear a room or a deck. That mix-up leads to disappointment when it’s treated like a bug-zapper rather than a fragrant houseplant.

• The geranium vs. grass distinction: The houseplant sold as citronella is a Pelargonium, not the Cymbopogon grass used for commercial citronella oil extraction. They’re different plants with different growing needs.
• Frost sensitivity: Unlike the tropical grass, the geranium dies back at freezing temperatures. That’s exactly why it’s often grown in containers and moved indoors for winter.
• Scent potency indoors: The lemon fragrance is strongest when the leaves are brushed or disturbed. Placing it in a hallway or near a door releases the smell as you walk by.
• Growth habit in pots: Indoors, the plant stays bushier and more compact than the sprawling outdoor version, making it a well-behaved houseplant.
• Common pest frustration: Whiteflies and aphids are attracted to indoor citronella, which surprises people who assumed the plant repelled every insect.

Knowing what you’re actually getting helps set realistic expectations. The citronella geranium is a fragrant, easy-care houseplant, not a mosquito barrier. Treat it like a scented geranium and you’ll have fewer disappointments.

The Indoor Care Routine That Works

Watering is where most people go wrong. Water your citronella once a week, letting the top inch of soil dry out between drinks. Morning watering is ideal because it lets the foliage dry before night, which cuts down on fungal problems.

Fertilize monthly during spring and summer with a balanced houseplant fertilizer. Skip feeding in winter when growth naturally slows. Regular pruning keeps the plant from getting leggy—pinch back the growing tips to encourage branching and a compact shape.

Pests show up even on well-cared-for plants. For aphids or whiteflies, a strong blast from the sink sprayer knocks them off before they establish a colony. The Spruce recommends you spray water for pests as an early intervention, and follow up with insecticidal soap or neem oil if they persist.

Common Indoor Growing Problems And Fixes

Even with solid care, citronella geraniums throw a few curveballs indoors. Here’s what to do when things go off track.

1. Yellowing leaves: Usually from overwatering. Let the soil dry out more between waterings and confirm the pot has drainage holes.
2. Leggy, sparse growth: Not enough light. Move it to a brighter window or add a grow light during darker winter months.
3. Leaf drop after moving indoors: The plant is adjusting to lower light and humidity. Give it a few weeks to acclimate, and avoid overwatering during the transition.
4. Pest outbreak (whiteflies, mealybugs): Isolate the plant right away. Spray with neem oil or insecticidal soap weekly, and check nearby plants for spread.
5. Brown leaf tips: Low humidity or salt buildup from fertilizer. Mist the plant occasionally or flush the soil with water to rinse out excess salts.

Most of these problems correct quickly once you adjust the environment. Citronella geraniums are forgiving plants that bounce back as long as the roots stay healthy.

Overwintering And Propagating Indoors

In climates where winter temperatures drop below freezing, bringing citronella indoors is a survival requirement. The plant can live as a houseplant all winter and move back outside in spring. Cut it back by about a third before bringing it in to reduce transplant shock and encourage compact regrowth.

If you want more plants, take 4-6 inch stem cuttings in late summer. Root them in water or moist potting mix, and you’ll have new plants to fill other windows. Per the citronella grow indoors guide from Gardening Know How, propagation from stem cuttings is straightforward and works reliably.

For gardeners in mild climates where temps stay above the 20s Fahrenheit, you can leave the plant in the ground. Cut it back and pile on a thick layer of mulch for winter protection. This works best in zones 9 and above.

The Bottom Line

Citronella geraniums adapt well to indoor life when you give them enough light and avoid overwatering. They won’t repel mosquitoes effectively indoors, but the fragrant lemon-scented foliage makes them a worthwhile houseplant on its own merits.

If your citronella isn’t thriving indoors after adjusting light and water, a local nursery or cooperative extension agent can help diagnose issues like soil pH or hidden pests specific to your growing conditions.