What is a coleus?
Coleus (Coleus scutellarioides, syn. Plectranthus scutellarioides) is a fast-growing tropical foliage plant in the mint family (Lamiaceae), native to Southeast Asia. What sets it apart is its extraordinary range of leaf color: a single species produces cultivars spanning solid chartreuse, deep burgundy, coral-pink, near-black, and intricate multi-color mosaics — often on the same plant. It is grown almost entirely for its leaves rather than its small, unremarkable flowers, which should be pinched off to keep the foliage coming.
Indoors, coleus behaves as a perennial and can live for several years with consistent pinching. Outdoors it is usually treated as an annual in frost-prone climates.
How much light does a coleus need?
Coleus is one of the few colorful plants that genuinely tolerates lower light — but “tolerates” is not the same as “prefers.” Bright, indirect light for 4–6 hours a day produces the richest, most saturated leaf color. In dim conditions the plant survives but colors fade toward muddy greens and growth slows. On the other end, prolonged direct indoor sun bleaches and scorches the leaves.
A practical rule: the darker the cultivar (maroon, near-black), the more forgiving it is of low light. Lime-green, yellow, and pale-pink cultivars need more brightness to hold their hue.
How often should you water a coleus?
Coleus has thicker, more water-retentive stems than many houseplants, but it still wilts dramatically if the soil dries out completely. Water every 5–7 days in active growth — when the top inch of soil feels dry. It likes consistently moist (not soggy) soil and a pot that drains freely. Overwatering is the more common mistake; soggy roots rot quickly, especially in a low-light spot where the soil stays wet longer.
During winter or low-light periods, stretch watering to every 8–10 days as the growth rate slows.
Why should you pinch coleus — and how?
Pinching is the most important maintenance task for coleus. The plant has a natural tendency to bolt — to shoot upward and produce tall flower spikes — which redirects energy away from leaf production and causes the lower leaves to drop. The moment you see a flower spike forming at any stem tip, snap it off with your fingers or scissors.
Beyond flower removal, pinch the growing tips of each stem every 3–4 weeks during the growing season. This forces the plant to branch at the node below the cut, doubling the number of stems and creating a dense, full shape. A well-pinched coleus is a completely different-looking plant from an unpinched one.
How do you propagate coleus from cuttings?
Coleus is one of the easiest houseplants to propagate. Take a 3–4 inch stem cutting just below a node, remove the leaves from the bottom half, and stand it in a small glass of water in bright indirect light. Roots appear within 7–14 days. Once they are half an inch long, pot the cutting into moist, well-draining soil.
This is especially useful for preserving a named cultivar — like ‘Kong Scarlet’ or ‘Black Dragon’ — over winter, since the parent plant may decline in low indoor light or cold drafts.
Is coleus toxic to pets?
Yes — the ASPCA lists coleus as toxic to cats and dogs. Essential oils in the foliage can cause vomiting, diarrhea, and depression if ingested. The risk is generally low unless a pet actively chews the leaves, but it is worth placing the plant on a high shelf or in a room the pet does not access.