Houseplant · Lamiaceae
Coleus
Coleus scutellarioides
Coleus packs a wallop of bold, painted leaves and powers color into a shady corner or a sunny bed with hardly any effort.
Bright indirect
USDA 10–11
0–3 ft · 0.2–0.9 m
Overview
Coleus throws all its energy into its leaves, and they deliver, blazing with greens, reds, purples, and gold in patterns that leave most flowers in the dust. It runs in the mint family and hails from the tropics of Southeast Asia and northern Australia. Outdoors it only winters over in the warmest zones, but indoors as a houseplant or in a container it takes off almost anywhere.
The real thrill is how fast and forgiving it grows, which makes it a blast for new growers. Give the tips a pinch every so often and it explodes into a dense, bushy mound instead of going tall and bare. Older types crave shade and bleach in hot sun, while newer ones like Wasabi and Pineapple charge ahead in full sun and keep their color, so the right spot just comes down to which one you grabbed.
Coleus is a tender perennial that most growers run as an annual, since the first frost shuts it down. The fun part: cuttings root so fast you can keep a plant cranking through winter on a windowsill and launch it back outside in spring. Let it flower and it coasts, so the one job that counts is pinching off the bloom spikes to keep those leaves pumping out color.
Care
The short version: find out whether your coleus is a sun or shade type, then give it bright indirect light indoors or the right sun-shade mix outside, keep the soil lightly moist so it never dries out or sits soggy, and pinch the tips often to send it bushing out fast.
Light
Coleus thrives in bright indirect light indoors, and the perfect outdoor spot rides on the cultivar. Shade-preferring types charge ahead in part shade to full shade and bleach in hot sun, while sun-tolerant selections hold their color out in full sun. Skimp on light, though, and any of them stretch out leggy and washed out.
Water
Keep the soil lightly moist at all times and never let it dry out, but do not drown it either. Water when the top inch feels dry, and bank on potted plants drinking faster and wanting it more often. Overdo the water and you stall the growth and mark the leaves, so let the extra drain right away.
Soil
Set coleus in moist, rich, loose soil that drains fast, packed with plenty of organic matter. That mix locks in the steady moisture coleus craves while still letting water race through, which keeps the roots from sitting wet and rotting.
Temperature
Coleus is a warm-weather tropical through and through and wants to stay above 50°F (10°C). Cold flat-out stops it, and the first frost finishes it off, so haul containers indoors well before the season flips.
Humidity
Everyday household humidity does the job, so there is no number to chase. Good airflow counts for more here, since stagnant, damp air around crowded plants is exactly what invites downy mildew and other leaf trouble.
Feeding
Fuel it through the active season, spring into summer, with a balanced bedding-plant fertilizer. A foliage formula like 24-8-16 blows past a high-phosphorus bloom feed, which only eggs the plant on to stretch and turn leggy.
Pruning
Pinch the stem tips often to fire off branching and keep the plant bushy and compact. Snip the flower spikes the moment they show in late summer, because once it blooms and sets seed coleus loses steam and slides into decline.
Repotting
Bump coleus up a pot as needed when you grow it as a houseplant or in containers, and pot up rooted cuttings the second they take. Roots circling or bursting from the drainage holes, water tearing straight through, and growth grinding to a crawl all shout it is time for a bigger pot.
Size & spacing
Coleus shoots from 6 to 36 inches (15 to 91 cm) tall, with a spread to match, depending on the cultivar and how hard you pinch. Pinch it often and it packs in fuller and more compact than it ever would left to run wild.
Troubleshooting
Almost every coleus snag comes down to two things: the light is wrong for the cultivar, or the watering swings too dry or too wet. The leaves and stems flash the warning early, so you can jump on it before it spreads. Spot your symptom below and get it back on track fast.
Stems blackening and folding after a freeze
Coleus is a tender tropical, and the first frost kills it outright, blackening the stems and dropping the whole plant. A frosted plant is done, so toss it. To keep a favorite charging on, take stem cuttings or pot it up and bring it indoors before the cold lands, since it only survives outdoors in USDA zones 10 to 11.
Fix:
- Take stem cuttings or dig and pot favorite plants before frost to overwinter indoors
- Move containers indoors before cold weather
- Discard frost-killed plants
Stunted growth and rot from soggy soil
Coleus loves steady moisture, but soil that stays waterlogged kicks off root and stem rot. The roots turn brown and mushy, the base of the stems goes soft, and growth stalls dead. Ease off the watering, get the pot or bed draining freely, and keep the soil lightly moist rather than soaked, and it gets going again.
Fix:
- Reduce watering and let excess drain away
- Ensure pots and beds have excellent drainage
- Avoid wetting foliage when watering
Angular brown blotches, leaves dropping, growth stalling
Yellowing, angular brown blotches, curling leaves, and dropped foliage flag downy mildew. Flip a leaf and hunt for white, purple, or gray fuzz on the underside only, sometimes needing a hand lens. It takes off between 60°F and 80°F (16°C to 27°C) once humidity tops 85%, so bag and bin the infected leaves, open the plant up for airflow, and water at the base to keep the foliage dry.
Fix:
- Remove and discard infected material in the trash, not compost
- Improve air circulation by spacing, thinning, and pruning
- Water at the base with drip irrigation rather than overhead, and keep foliage dry
Flower spikes shooting up as vitality drops
Coleus is all about its leaves, so those slim spikes of small blue-violet flowers are a problem, not a prize. Once a plant flowers and sets seed in late summer, the foliage show falls apart and the plant loses vigor. Pinch the spikes off the instant they show, and keep pinching to drive that energy straight back into the leaves.
Fix:
- Pinch or cut off flower spikes as soon as they appear
- Continue pinching to redirect energy into foliage
Wilting, drooping leaves
Coleus wilts fast the moment the soil dries out, and a potted one droops soonest of all, so check the soil first. A thirsty plant usually springs back within hours of a good drink. A shade-loving type can also flag in too much afternoon sun, so move it somewhere with a break from the heat and watch it perk up.
Fix:
- Water thoroughly and keep soil lightly moist
- Increase watering frequency for containers
- Provide afternoon shade for non-sun-tolerant cultivars
Sticky, distorted leaves crawling with bugs
Indoor coleus pulls in sap-feeders, so keep an eye out for soft white cottony mealybugs, clusters of aphids, or clouds of tiny whiteflies. In warm, dry rooms, spider mites pile on with fine webbing and stippled leaves. Rinse the plant, pull it away from the rest, and hit it with insecticidal soap, repeating until the bugs are wiped out.
Fix:
- Treat with insecticidal soap
- Rinse plants and isolate affected specimens
- Repeat treatments as needed for indoor infestations
Stems shooting up leggy and pale
Stretched stems and washed-out color spell legginess, and it usually means the light is wrong for the cultivar or the tips never got pinched. A shade type bleaches in harsh sun while a sun type stretches and pales in deep shade, leaving long internodes and bare lower stems. Move it to the right light, pinch the growing tips often, and cut the gangly stems back hard, and it bounces back into dense, full growth fast.
Fix:
- Move to the light level recommended for the cultivar (bright indirect light indoors; correct sun/shade outdoors)
- Pinch growing tips regularly to force branching
- Cut back leggy stems to encourage dense regrowth
Leaves bleaching fast in blazing sun
Most older coleus run shade-preferring, so hot direct sun blasts the color right out of their leaves and can leave them wilting. The fix is to shift that plant to part shade or dappled light. Chasing a bright, sunny spot? Grab a sun-tolerant cultivar like Wasabi or Pineapple instead, since those keep their color blazing in full sun.
Fix:
- Move shade-type cultivars to part shade or dappled light
- Choose sun-tolerant cultivars (e.g., 'Wasabi', 'Pineapple') for full-sun sites
Toxicity
Coleus is mildly toxic to pets, so it pays to know the score. The essential oils in the leaves can hit cats and dogs with vomiting, diarrhea, and skin irritation, and the ASPCA lists it as toxic to horses too. People come through essentially safe, though the sap can irritate skin, so keep it clear of pets and rinse your hands once the pruning is done.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
Coleus leaves carry mildly toxic essential oils, and cats react to them. A curious cat that gnaws a leaf tends to drool and turn queasy, with vomiting or loose stools to follow, and the sap can redden its mouth or skin.
Dogs Mild
A dog that nibbles the foliage tends to vomit, run loose stools, and skip its food for a day. The reaction is mild, though the sap can also redden the skin and mouth.
Horses Mild
Horses make the ASPCA's toxic list as well, since the very same oils stir up gut trouble and sink them into a listless, off-feed slump. Fence grazers well away from the planting beds.
Rabbits Caution
The aromatic oils that bother cats and dogs make coleus a poor choice around rabbits, so keep it out of reach rather than risk an upset gut.
Livestock Caution
Cattle, goats, and sheep are not well documented with coleus, but the same irritant oils warrant caution, so fence it off from anything that grazes.
Birds Caution
There is little hard data on birds, and pet species can be sensitive to plant oils, so treat coleus as off-limits and keep it away from cages and aviaries.
People Caution
People have little to fear from coleus, though its sap can nettle the skin. Handle it again and again and an allergic rash may flare, so pull on gloves and clean your hands when the pruning wraps up.
Wear gloves or wash hands after handling or pruning; repeated, frequent skin contact can cause allergic dermatitis
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Coleus rolls out in hundreds of cultivars, and they break down into two camps that make picking easy: shade-preferring types and the newer sun-tolerant ones. These are the names that pop up again and again.
'Wizard' series
A popular seed-grown series of compact, shade-preferring coleus that is easy to grab and fills out in a hurry.
'Kong' series
A shade lover grown for its giant leaves, which run far larger than those of most other coleus.
'Wasabi'
A sun-tolerant standout with bright chartreuse-green foliage that keeps its color blazing in a full-sun spot.
'Pineapple'
A sun-tolerant selection from the Pineapple group that delivers wherever the light runs strong.
'Alabama Sunset'
A sun-tolerant cultivar that powers through bright light without bleaching the way older shade types do.
How to propagate
Coleus is a dream to multiply, and one plant can fuel a whole batch fast, whether you root a cutting in a glass of water or kick off a tray from seed.
Stem cuttingsEasy
Spring through summer · Roots in about 2 weeks (often in water)
Coleus roots so eagerly that a tip cutting dropped in a plain glass of water strikes roots in about two weeks. Take cuttings any time from spring through summer. It is the fastest, simplest way to carry a favorite through winter, since the parent will not survive frost outdoors.
SeedEasy
Spring · Germinates in 10-15 days at 70-75°F
Loads of the named series grow from seed. Sow in spring and keep the tray warm, around 70°F to 75°F (21°C to 24°C), and the seedlings burst up in 10 to 15 days. Cuttings clone an exact plant, but seed is the quick route to a whole tray in one go.
Myths
Coleus is grown for its flowers.
Coleus earns its keep with bold, multicolored leaves, not the bloom. The small blue-violet flowers are slight, and once they form the plant coasts and loses vigor. Pinch the spikes off and the foliage keeps firing on all cylinders.
Coleus is harmless to pets.
The ASPCA lists coleus as toxic to cats, dogs, and horses thanks to the essential oils in its leaves. A pet that chews it can drool, vomit, and run loose stools, and the sap may irritate skin. The reaction is mild, but keeping it out of reach is the smart move.
All coleus must be grown in shade.
The older cultivars really do prefer part shade and bleach in hot sun, which is where the idea started. Tons of newer selections, though, are bred to hold their color in full sun. The right light comes down entirely to the cultivar you have.