Coleus (painted nettle) care

Light

Coleus thrives in bright indirect light — the conditions just back from a sunny window, with plenty of ambient brightness but rarely any direct rays on the leaves themselves. Sun cultivars take direct sun outdoors; shade cultivars want bright indirect light indoors. If you are not sure whether your spot is bright enough, a free phone lux-meter app at midday is the quickest way to check; aim for 800-1,500 lux.

Watering

Water coleus when the top 1-2 cm of soil is dry, every 4-7 days. The actual day count varies with pot size, light level, and the season — the finger test (or, better, lifting the pot to feel its weight) is more reliable than a calendar. Empty any drainage saucer after watering so the pot is never sitting in water. Wilts dramatically when dry; perks up after watering. Avoid drying out repeatedly.

Soil and pot

Coleus grows best in rich free-draining mix. Compost with 20% perlite. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Coleus sits happiest at around 50-60% humidity and 18-27°C (65-80°F). Average household humidity is fine. If you keep the room above 18 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed coleus sparingly. Half-strength balanced feed every 2-3 weeks in growing season. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on coleus in the Growli community. Each is annotated with the most common cause so you know where to start.

• Leggy stems — Pinch flowers and growing tips every 1-2 weeks.
• Faded colour — Insufficient light for the cultivar.
• Wilted leaves — Coleus wilts fast; water and they recover within hours.
• Mealybugs and whitefly — Common indoor pests; treat with horticultural soap.

Propagation

Stem cuttings root in water in 1-2 weeks. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Coleus is mildly toxic to pets. ASPCA lists Coleus (Plectranthus scutellarioides) as toxic to cats, dogs, and horses due to essential oils. Symptoms include vomiting, diarrhoea, and depression. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Coleus deep-dive guides

Every aspect of coleus care, each with its own calibrated guide:

• Coleus watering schedule
• Coleus light requirements
• Best soil mix for coleus
• Coleus fertilizing guide
• When to repot coleus
• How to propagate coleus
• Coleus growth rate & size
• Coleus cold hardiness
• Coleus temperature & humidity
• Is coleus toxic to cats & dogs?
• Getting coleus to bloom

Related guides

Coleus is also known as painted nettle, flame nettle, and Plectranthus scutellarioides.

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• All 200 plant care guides in the Growli library