Coleus is grown for its leaves, and no other common houseplant comes in so many colours: lime green, deep red, hot pink, purple, orange and near-black, often several colours on a single leaf. It is a fast grower, it is cheap, and it is one of the easiest plants to propagate — which is why it is a favourite for filling a bright windowsill. It is also a plant that tells you what it wants. The colours fade when the light is too low, the stems stretch when it is not pinched, and it wilts dramatically when it is thirsty — then perks up within hours of watering. Give it bright light, regular water and a pinch now and then, and it will reward you with colour all year. This guide covers exactly what it needs: light, watering, humidity, temperature, soil, repotting, feeding, propagation and the common problems that show up when something is off.
Coleus at a glance
| Care factor | What this plant needs |
|---|---|
| Botanical name | Coleus scutellarioides |
| Light | bright indirect |
| Water | every 1–2 weeks; let top soil dry |
| Humidity | moderate |
| Temperature | 65–80°F (18–27°C) |
| Repotting | every 2–3 years |
| Pet safety | toxic to cats and dogs |
Light
Give your Coleus bright indirect light. Light is what makes the colours — in too little light the leaves fade to dull green and the plant grows thin and leggy, while in good light the colours stay vivid and the growth stays compact. A spot near a bright east- or west-facing window is ideal, or a metre or so back from a bright south-facing window. Our grow-light calculator can help work out whether your spot is bright enough.
A little gentle direct sun — early morning or late afternoon — usually suits coleus and can even deepen the colours, but harsh midday sun through glass can scorch the leaves, leaving pale, bleached patches that do not heal. Use a sheer curtain on a south-facing window, and rotate the pot a quarter turn every couple of weeks so it grows evenly.
Watering
Water every 1–2 weeks; let top soil dry. Coleus likes its soil to dry out at the top between waterings, but it is a thirsty plant in active growth — the soft leaves lose water fast in a warm room, and it wilts dramatically when it is dry. Water thoroughly until water runs out of the drainage holes, then empty the saucer so the plant never sits in standing water. Our watering calculator gives a starting point for your pot size, and the watering schedule generator can help you build a routine around it.
A wilted coleus usually recovers within hours of watering, but do not let it wilt repeatedly — it stresses the plant and the lower leaves drop. In winter, when growth slows, ease off slightly and let the soil dry a little more between waterings.
Humidity and temperature
Coleus needs moderate humidity and temperatures of 65–80°F (18–27°C). Ordinary indoor humidity suits it, though the leaf edges will crisp a little in very dry, heated air in winter — grouping plants together or using a pebble tray under the pot helps. Our humidity and temperature checker can tell you whether your room suits this plant.
Keep it away from cold draughts from doors and windows, and from radiators and air-conditioning vents that blast hot or cold air directly at it. Coleus is a tropical plant that hates the cold — a chill can damage the soft leaves quickly, so move it away from a cold window on frosty nights.
Soil and potting
Indoors, this plant needs a rich but free-draining potting mix. Standard potting soil mixed with perlite works well — the mix should hold some moisture but let excess water drain away quickly, because coleus roots rot fast in a heavy, wet mix. A pot with drainage holes is not optional. Our potting-mix calculator can work out the parts for a homemade mix for your pot size.
Because coleus grows fast, it fills a pot quickly and drinks fast in summer, so a slightly larger pot than you would use for a slow grower is reasonable. Pinch the growing tips regularly to keep the plant bushy — if you never pinch it, it grows tall, thin and bare at the base.
Repotting
Repot every 2–3 years, in spring, or sooner if roots are circling the drainage holes or the plant is drying out much faster than it used to. Coleus grows fast in warm, bright conditions and fills a pot sooner than most houseplants. Move up only one pot size — a pot that is too big holds wet soil the roots cannot use. Our repotting calculator can help you work out the next pot size and how much fresh mix you will need.
Feeding
Feed during the growing season, in spring and summer, with a balanced liquid houseplant fertiliser at half the strength on the label, roughly once a month while the plant is actively growing. Do not feed in autumn and winter when growth slows. Always follow the directions on the label — more fertiliser is not better, and excess salts build up in the soil and burn the roots, which often shows up as brown leaf edges. Our fertiliser calculator can work out the right dose for your pot size.
Propagation
Coleus is propagated by stem cuttings, and it is one of the easiest houseplants to propagate — cuttings root in days, not weeks. Take a healthy stem tip about 10 cm long, remove the lower leaves, and place it in water or moist mix. Roots usually appear within a week, and the cutting can be potted up as soon as the roots are a few centimetres long.
Because it roots so easily, coleus is the plant to practice propagation on. Pinch the tip of a young cutting once it is established to encourage it to branch, and you will have a bushy plant within a few weeks. Many growers take cuttings in late summer to keep fresh plants through winter.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Pests | check undersides of leaves regularly | Check leaf undersides; remove by hand and repeat weekly. |
| Yellow Leaves | overwatering | Let soil dry more between waterings; check drainage. |
| Brown Leaf Tips | low humidity | Raise humidity; keep away from radiators; flush soil if over-fertilised. |
Pests
Likely cause: check undersides of leaves regularly. Coleus is not especially pest-prone, but aphids and whitefly love the soft new growth, and mealybugs can hide in the leaf joints. Check the undersides of the leaves and the growing tips every few weeks. Remove pests by hand or rinse the plant gently with water, and repeat weekly until they are gone. Our pest identifier helper can help confirm what you are dealing with.
Yellow Leaves
Likely cause: overwatering. Yellow leaves, especially lower ones, most often mean the soil has stayed wet for too long. Let the top of the soil dry out before watering again, check that the pot drains freely, and remove the yellow leaves. Some yellowing of the lowest leaves is also normal on a fast-growing plant as it puts its energy into new growth at the top.
Brown Leaf Tips
Likely cause: low humidity. Brown, crispy tips and edges usually mean the air is too dry, particularly in a heated room in winter. Raise the humidity by grouping plants together or using a pebble tray, and keep the plant away from radiators. Brown tips can also come from over-fertilising, so flush the soil with plain water if you have been feeding heavily.
Frequently asked questions
How often should I water Coleus?
Water every 1–2 weeks and let the top soil dry first. Water thoroughly until it runs out of the drainage holes, then empty the saucer. Coleus wilts dramatically when thirsty but usually recovers within hours of watering — try not to let it wilt repeatedly.
How much light does Coleus need?
It needs bright indirect light. Light is what makes the colours — in too little light the leaves fade to dull green and the plant grows leggy. A little gentle morning sun helps the colours stay vivid; harsh midday sun scorches the leaves.
Is Coleus safe for cats and dogs?
According to the data used for this guide, this plant is toxic to cats and dogs. Keep it out of reach of pets that chew plants, and if a pet eats any of it, contact your vet.
Why is my Coleus getting leggy?
That is almost always too little light, combined with not pinching the tips. Move it to a brighter spot and pinch the growing tips regularly — pinching makes the plant branch and grow bushy instead of tall and bare. You can propagate the pinched tips as cuttings.
Should I let my Coleus flower?
Most growers pinch the flower spikes off as soon as they appear. Coleus is grown for its leaves, and flowering takes energy away from leaf growth and can make the plant leggy. Pinching the flowers keeps the foliage full and colourful.