Houseplant · Lamiaceae
Coleus
Coleus scutellarioides
Coleus carries bold, painted leaves marbled in color, the kind that brightens a shady corner or a sunny bed with little fuss.
Bright indirect
USDA 10–11
0–3 ft · 0.2–0.9 m
Overview
Coleus is grown for its leaves, and they are the whole spectacle: broad, soft, nettle-shaped blades streaked and splashed with greens, reds, purples, and gold in patterns no flower could match, often edged or veined in a contrasting tone. It belongs to the mint family, and like its kin it carries square stems and paired leaves up tropical Southeast Asia and northern Australia. Hardy outdoors only in the warmest zones, it grows well as a houseplant or a container plant almost anywhere.
The plant is fast and forgiving, which makes it a favorite for beginners. Pinched at the tips, it thickens into a dense, branching mound of overlapping leaves rather than a few long, bare stems. Older cultivars want shade and their leaf color bleaches and pales in hot sun, while newer ones such as Wasabi and Pineapple keep their saturated tones in full sun, so the right spot depends on which one you have.
Coleus is a tender perennial grown as an annual, since the first frost ends it. Its stems root so readily that a single cutting carries the same leaf pattern through winter on a windowsill and back outside in spring. When it blooms it sends up slim spikes of small blue-violet flowers, and once those set seed the bright foliage fades, so the one real task is pinching off the bloom spikes to keep the leaves vivid and full.
Care
The short version: give coleus the light its cultivar was bred for, either bright indirect light indoors or a fitting blend of sun and shade outside. Hold the soil at an even, light dampness so it never parches or turns to muck, and nip the growing tips often to pack the painted leaves into a dense, layered mound.
Light
Coleus does best in bright indirect light indoors, and the right outdoor exposure depends on the cultivar. Shade-preferring types take part shade to full shade, and their leaf color washes pale in hot sun, while sun-tolerant selections keep their deep tones in full sun. Too little light leaves any of them stretched, with thin, washed-out leaves.
Water
Keep the soil lightly moist at all times and never let it dry out, but do not leave it soggy. Water when the top inch of soil feels dry, and note that plants in pots dry out faster and need it more often. Overwatering stunts the plant and marks the leaves with damage, so let any excess drain away.
Soil
Set coleus into a loose, crumbly, moisture-holding soil enriched with generous organic matter and quick to drain. Open like that, the ground stays evenly damp for the plant yet lets surplus slip away, so the roots never stew in the wet and rot.
Temperature
This is a heat-loving tropical that needs to stay above 50°F (10°C). Cold does it no favors at all, and a single frost turns the stems black and finishes it, so carry pots inside in good time before the weather cools.
Humidity
Ordinary indoor humidity is plenty, so there is no target to hit. What counts more is moving air, because still, moist air trapped among a mass of overlapping leaves is exactly what lets downy mildew and similar leaf troubles take hold.
Feeding
During the active stretch from spring into summer, offer a balanced bedding-plant fertilizer. Reach for a leaf-oriented formula like 24-8-16 rather than a high-phosphorus bloom feed, which only drives the stems long and bare between the leaves.
Pruning
Pinch the stem tips often to force branching and keep the plant bushy and compact, with leaves packed close together. Cut off the slim flower spikes as soon as they appear in late summer, because letting it bloom and set seed makes the foliage fade and the plant decline.
Repotting
Repot as needed when you grow coleus as a houseplant or in containers, and pot up rooted cuttings as they take. Watch for roots circling or emerging from the drainage holes, water running straight through, and growth that slows, which all signal it is time for a bigger pot.
Size & spacing
Coleus runs from 6 to 36 inches (15 to 91 cm) tall, with a spread to match, depending on the cultivar and how hard you pinch it. Regular pinching builds a fuller, more compact mound of overlapping leaves than the plant forms left alone.
Troubleshooting
Most coleus trouble shows up first in the leaves and stems, and it usually traces to the wrong light for the cultivar or water that has run too dry or too wet. A close look at leaf color, the spacing between leaves, and the texture of the stems tells you the cause early. Match what you see below, then act while it still helps.
Blackened, limp stems after a freezing night
A tender tropical to its core, coleus meets the first frost and dies outright, its stems going black and slick as the whole plant folds down. Nothing brings a frosted plant back, so throw it out. Save a treasured leaf pattern by rooting stem cuttings or potting the plant and carrying it indoors ahead of the cold, since it lives 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
Steady moisture suits coleus, but ground that stays sodden invites root and stem rot. Down below, the roots go brown and slimy, the stem bases turn soft and dark, and fresh growth simply halts. Cut back on watering, confirm the pot or bed sheds water freely, and aim for lightly damp soil in place of a soaked one.
Fix:
- Reduce watering and let excess drain away
- Ensure pots and beds have excellent drainage
- Avoid wetting foliage when watering
Angular brown blotches speckling curling, dropping leaves
Sharp-edged brown blotches between the veins, yellowing, curling blades, and leaves let go early all point to downy mildew. Flip a leaf and study the underside alone for a white, purple, or gray fuzz, faint enough that a hand lens may help. Warmth of 60°F to 80°F (16°C to 27°C) together with humidity above 85% is what this mildew loves, so seal the sick leaves in a bag for the trash, thin the plant to move air through it, and pour water low at the roots to leave the blades 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
Slim bloom spikes rising as leaves fade
Leaves are the whole point of coleus, which makes those narrow spikes of tiny blue-violet flowers a nuisance rather than a treat. Let a plant flower and set seed in late summer and the colored canopy turns sparse and dull while the plant weakens. Nip the spikes away the instant you notice them, and stay at it so the plant pours its strength back into foliage.
Fix:
- Pinch or cut off flower spikes as soon as they appear
- Continue pinching to redirect energy into foliage
Wilting, drooping leaves
Let the soil run dry and coleus flags quickly, its soft blades and stems folding over, and one in a pot droops before any other. Feel the soil first, because a thirsty plant tends to stand firm again within hours of a thorough drink. A shade-loving type may also wilt under strong afternoon sun, so give it a spot that rests from the heat.
Fix:
- Water thoroughly and keep soil lightly moist
- Increase watering frequency for containers
- Provide afternoon shade for non-sun-tolerant cultivars
Sticky, puckered leaves dotted with insects
Indoor coleus draws sap-feeders, and you will spot soft white cottony mealybugs tucked in the leaf joints, clusters of aphids, or clouds of tiny whiteflies. In warm, dry rooms, spider mites add fine webbing and a stippled, speckled look across the leaf surface. Rinse the plant, isolate it from the rest, and treat with insecticidal soap, repeating until the bugs are gone.
Fix:
- Treat with insecticidal soap
- Rinse plants and isolate affected specimens
- Repeat treatments as needed for indoor infestations
Gangly bare stems with drained leaf color
Those long naked stretches of stem, with wide gaps between pale, washed-out leaves, are the face of legginess. Behind it sits a cultivar in the wrong light or tips left unpinched: a shade type fades under fierce sun, and a sun type reaches and grows pallid in deep shade, drawing out the internodes until the lower stems stand bare. Shift it into the light it wants, keep nipping the tips, and shear the drawn-out stems back hard so thick, leafy growth breaks from low down.
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
Scorched, color-drained leaves after strong sun
The older coleus lean shade-preferring, so a blast of hot, direct sun drains the painted markings toward pale and can set the blades drooping. Give such a plant dappled light or a part-shade corner and its color steadies. Where a site stays bright and sunny, set out a sun-tolerant cultivar instead, one like Wasabi or Pineapple that keeps its tones deep under 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
Pets face only mild toxicity from coleus. Oils stored inside the leaves can bring on vomiting, diarrhea, and skin irritation in dogs and cats, and horses land on the ASPCA's toxic list as well. For people the plant is largely safe, though its sap may sting the skin, so set it beyond a pet's reach and rinse your hands once the pruning is done.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
For cats, the leaf oils carry a mild toxicity. Chew on the soft blades and a cat will typically slobber, turn queasy, and vomit or pass loose stools, while the sap can redden the mouth or skin.
Dogs Mild
Nibble the foliage and a dog is apt to be sick, pass runny stools, and skip meals for a day. It stays a mild upset, though the sap may also leave the skin and mouth reddened.
Horses Mild
Horses share the toxicity the ASPCA flags for cats and dogs, the leaf oils churning the stomach and dulling them off their feed. Keep hooved grazers clear of any 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
Solid evidence on birds is thin, and companion species can react badly to plant oils, so rule coleus out and keep it clear of cages and aviaries.
People Caution
Coleus is basically harmless to people, yet the sap can sting bare skin. Frequent, repeated contact now and then raises an allergic rash, so keep gloves on and rinse your hands when you finish pruning.
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
Hundreds of coleus cultivars exist, each with its own leaf color, margin, and marbling, yet they fall into two camps: the shade-preferring old guard and the newer selections that take sun. The names below are the ones you meet most.
'Wizard' series
A popular seed-grown series of compact, shade-preferring coleus with rounded, full leaves that is easy to find and quick to fill out.
'Kong' series
A shade lover grown for its outsized leaves, broad blades that run far larger than those of most other coleus.
'Wasabi'
A sun-tolerant pick with bright chartreuse-green foliage that holds its lime tone in a full-sun spot.
'Pineapple'
A sun-tolerant Pineapple-group selection that holds up where light falls bright and strong.
'Alabama Sunset'
A sun-tolerant cultivar whose warm, sunset-toned leaves take bright light without bleaching the way older shade types do.
How to propagate
Few plants multiply as readily as coleus, and a cutting reproduces the parent's exact leaf coloring whether you stand it in a glass of water or raise 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 pushes out fine white roots in about two weeks. Take cuttings any time from spring through summer. This is the simplest way to carry a favorite leaf pattern 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 are grown from seed. Sow in spring and keep the tray warm, around 70°F to 75°F (21°C to 24°C), and the small green seedlings come up in 10 to 15 days. Cuttings clone an exact plant, color and all, but seed is the easy route to a whole tray at once.
Myths
Coleus is grown for its flowers.
What makes coleus worth growing is the riot of color across its leaves, never the flowers. Those little blue-violet blooms amount to almost nothing, and the moment they appear the plant eases off and weakens. Pinch the spikes away and the leaves keep their full, saturated color.
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 the foliage can drool, vomit, and run loose stools, and the sap may irritate skin. The reaction is mild, but keep the leaves out of reach all the same.
All coleus must be grown in shade.
The older cultivars do prefer part shade and their leaf color bleaches in hot sun, which is where this idea comes from. Plenty of newer selections, though, are bred to hold their saturated color in full sun. The right light depends entirely on the cultivar you have.