Houseplant · Lamiaceae
Coleus
Coleus scutellarioides
With its bold, painted leaves, coleus drops a wash of color into a shaded corner or a sunny bed and lifts the whole room with it.
Bright indirect
USDA 10–11
0–3 ft · 0.2–0.9 m
Overview
Coleus is a foliage plant first, and its leaves do the decorating, layered in greens, reds, purples, and gold that pull a color scheme together better than most blooms. It belongs to the mint family and carries the easy, tropical spirit of Southeast Asia and northern Australia. Outdoors it settles only into the warmest zones, but as a potted accent indoors or a filler in a container display, it earns a place in almost any home.
What makes coleus such a generous houseguest is how fast and forgiving it is, which suits a busy household. A casual pinch now and then keeps it full and rounded rather than tall and sparse, so it always reads as styled rather than neglected. Older types prefer a shaded spot and the newer ones such as Wasabi and Pineapple take a sunny windowsill in stride, so you can place it to suit the room and the light you actually have.
Treat coleus as a seasonal companion: a tender perennial that most people enjoy as an annual, since the first frost closes the chapter. The lovely part is that cuttings root so easily you can keep a plant going through winter on a kitchen sill and bring it back to the patio in spring. Built into the routine is one small ritual, pinching off the bloom spikes, which keeps the foliage the centerpiece it was meant to be.
Care
The short version: place your coleus by what its cultivar wants, giving it bright indirect light indoors or the right sun-shade balance outside, keep the soil lightly moist so it never dries out or sits soggy, and work a quick pinch of the tips into your routine to keep it full and well dressed.
Light
Indoors, coleus looks its best in bright indirect light, the kind a sheer-curtained window gives, and the right outdoor spot comes down to the cultivar. Shade-preferring types are content in part shade to full shade and bleach in hot sun, while sun-tolerant selections keep their color in full sun. Too little light, though, leaves any of them leggy and faded rather than lush.
Water
Keep the soil lightly moist at all times, never bone dry and never waterlogged, and the plant stays presentable. Water when the top inch feels dry, and remember that a decorative pot dries out faster than a bed, so it will want attention more often. Overwatering stunts growth and spots the leaves, so let any excess drain through.
Soil
Set coleus in moist, rich, loose soil that drains well, blended with plenty of organic matter. That mix holds the steady moisture the plant likes while letting water move on through, which keeps the roots from sitting wet and rotting under a handsome surface.
Temperature
Coleus carries a tropical disposition and wants to stay above 50°F (10°C), with no patience for a cold draft. The first frost ends it outright, so bring patio containers back indoors well before the evenings turn, where they read as a fresh seasonal accent.
Humidity
Ordinary household humidity suits it fine, so there is no figure to chase across the seasons. Good airflow matters more, since a crowded shelf of damp, still air is what invites downy mildew and other leaf problems that spoil the look.
Feeding
Feed through the growing season, spring into summer, with a balanced bedding-plant fertilizer to keep the color rich. A foliage formula such as 24-8-16 outdoes a high-phosphorus bloom feed, which only encourages the plant to stretch and grow leggy.
Pruning
Pinch the stem tips often to coax branching and hold the plant bushy and compact, the shape that suits a tidy pot. Snip the flower spikes as soon as they show in late summer, because letting it bloom and set seed costs coleus its vigor and its full, styled form.
Repotting
Move coleus up a pot size as needed when you keep it as a houseplant or in containers, and pot up rooted cuttings as they take. Roots circling or escaping the drainage holes, water running straight through, and growth slowing all signal it is time for a roomier pot to keep the display thriving.
Size & spacing
Coleus ranges from 6 to 36 inches (15 to 91 cm) tall, with a matching spread, depending on the cultivar and how often you pinch, which makes it easy to scale to a tabletop or a floor planter. Regular pinching keeps it fuller and more compact, so it sits neatly wherever you style it.
Troubleshooting
Most coleus setbacks come down to two everyday things: the light does not suit the cultivar, or the watering has slipped too dry or too wet. Read the leaves and stems with a glance over morning coffee and the cause usually shows itself early. Match what you see below, then make the small adjustment while it still does some good.
Overnight collapse and darkened stems after the cold
Coleus is a tender tropical, and the first frost kills it outright, blackening the stems and collapsing the whole plant overnight. A frosted plant cannot be revived, so retire it. To keep a favorite color scheme going, take stem cuttings or pot the plant up and bring it indoors before the cold settles in, since it survives outdoors only 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 enjoys steady moisture, but soil that stays waterlogged invites root and stem rot beneath an otherwise pretty surface. The roots turn brown and mushy, the base of the stems softens, and growth stalls. Ease off the watering, make sure the pot or bed drains freely, and keep the soil lightly moist rather than soaked to keep the plant looking its part.
Fix:
- Reduce watering and let excess drain away
- Ensure pots and beds have excellent drainage
- Avoid wetting foliage when watering
Angular brown mottling with leaf loss and stunting
Yellowing, angular brown blotches, curling leaves, and dropped foliage are the marks of downy mildew. Turn a leaf over and look for white, purple, or gray fuzz on the underside only, sometimes needing a hand lens to catch. It thrives between 60°F and 80°F (16°C to 27°C) once humidity climbs above 85%, so bag and bin the affected leaves, give the plant more breathing room, 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
Blooming spikes emerging as the plant declines
Coleus is grown for its leaves, so those slim spikes of small blue-violet flowers are a distraction from the display rather than an asset. Once a plant flowers and sets seed in late summer, the foliage loses its polish and the plant loses vigor. Pinch the spikes off as soon as they appear and keep at it, so the energy flows back into the leaves that anchor the look.
Fix:
- Pinch or cut off flower spikes as soon as they appear
- Continue pinching to redirect energy into foliage
Wilting, drooping leaves
Coleus wilts quickly once the soil dries, and a decorative pot droops soonest of all, so check the soil before you fret. A thirsty plant usually rebounds within hours of a good drink and looks none the worse for it. A shade-loving type can also flag in too much afternoon sun, so move it to a spot with a break from the heat if the soil is fine.
Fix:
- Water thoroughly and keep soil lightly moist
- Increase watering frequency for containers
- Provide afternoon shade for non-sun-tolerant cultivars
Tacky leaves, deformed growth, and visible pests
Indoor coleus attracts sap-feeders, so look for soft white cottony mealybugs, clusters of aphids, or clouds of tiny whiteflies marring the leaves. In warm, dry rooms, spider mites can add fine webbing and stippling. Rinse the plant, set it apart from the rest of the display, and treat with insecticidal soap, repeating until the foliage is clean again.
Fix:
- Treat with insecticidal soap
- Rinse plants and isolate affected specimens
- Repeat treatments as needed for indoor infestations
Lanky stems and dulled, colorless foliage
Stretched stems and color that has gone flat point to legginess, usually because the light does not match the cultivar or the tips were left unpinched. A shade type bleaches in harsh sun while a sun type stretches and pales in deep shade, both leaving long internodes and bare lower stems that read as untidy. Shift it into the right light, pinch the growing tips often, and cut the gangly stems back hard to bring back the dense, well-dressed shape.
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
Sun-washed, scorched foliage losing its color
Most older coleus are shade-preferring, so a hot, sun-drenched windowsill washes the color from their leaves and can leave them wilting. The remedy is to move that plant to part shade or dappled light where it looks its best. If a bright spot is the one you want to fill, choose a sun-tolerant cultivar such as Wasabi or Pineapple, which holds its color 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, worth knowing before it joins the living room. The essential oils in the leaves can leave cats and dogs with vomiting, diarrhea, and skin irritation, and the ASPCA lists it as toxic to horses as well. People are essentially safe, though the sap can irritate skin, so give it a shelf or sill out of a pet's reach and rinse your hands after pruning.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
The essential oils in the leaves are mildly toxic to cats. A cat that chews them usually drools and gets an upset stomach with vomiting or diarrhea, and the sap can leave a mouth or skin irritation, so keep the pot above a curious paw.
Dogs Mild
A dog that nibbles the foliage tends to vomit, run loose stools, and lose interest in food for a day. The reaction is mild, though the sap can also redden the skin and mouth, so place the plant beyond easy reach.
Horses Mild
Horses join cats and dogs on the ASPCA's toxic roster, the identical oils unsettling the stomach and flattening the appetite. Site the planting beds where grazing animals cannot reach.
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
For people, coleus poses essentially no danger, even if its sap may leave the skin irritated. Handle it often enough and an allergic rash can surface, so slip on gloves and rinse your hands once the pruning is done.
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 arrives in hundreds of cultivars, yet for styling a space they sort into two simple wardrobes: the shade-preferring types and the newer sun-tolerant ones. These are the names that show up most often when you go shopping.
'Wizard' series
A popular seed-grown series of compact, shade-preferring coleus that is easy to source and quick to fill a pot.
'Kong' series
A shade lover prized for its outsized leaves, which run far larger than most other coleus and make a bold tabletop statement.
'Wasabi'
A sun-tolerant pick with bright chartreuse-green foliage that holds its color on a full-sun sill.
'Pineapple'
A sun-tolerant selection from the Pineapple group, dependable for the brightest spot in a room.
'Alabama Sunset'
A sun-tolerant cultivar that takes a strong, sunny exposure without bleaching the way older shade types do.
How to propagate
Coleus is wonderfully easy to multiply, so a single plant can furnish a whole windowsill or a row of matching pots, whether you root a cutting in water or sow a tray from seed.
Stem cuttingsEasy
Spring through summer · Roots in about 2 weeks (often in water)
Coleus roots so willingly that a tip cutting set in a plain glass of water strikes roots in about two weeks, which makes a simple windowsill propagation display in itself. Take cuttings any time from spring through summer. It is the easiest way to carry a favorite plant through winter, since the parent will not survive frost outdoors.
SeedEasy
Spring · Germinates in 10-15 days at 70-75°F
Many of the named series start from seed, an easy way to fill a whole row of matching pots. Sow in spring and keep the tray warm, around 70°F to 75°F (21°C to 24°C), and the seedlings come up in 10 to 15 days. Cuttings copy a plant exactly, while seed is the simple route to a tray at once.
Myths
Coleus is grown for its flowers.
Coleus earns its spot in a room with its bold, multicolored leaves, not its bloom. The small blue-violet flowers are slight, and once they form the plant starts to coast and lose vigor. Pinch the spikes off and the foliage holds its place as the centerpiece.
Coleus is harmless to pets.
The ASPCA lists coleus as toxic to cats, dogs, and horses because of 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 a high shelf out of reach keeps everyone at ease.
All coleus must be grown in shade.
Older cultivars do prefer part shade and bleach in hot sun, which is where the idea took hold. Many newer selections, though, are bred to keep their color on a sunny sill. The right placement comes down to the cultivar you choose for the space.