Croton (Codiaeum): Care, Varieties and Leaf Drop

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Croton looks like autumn foliage in a pot: yellow, orange, red and almost black veins on leathery, glossy leaves. But to get those colours, croton needs light, warmth and stability — it dislikes change and often responds by dropping leaves. Here is how to care for croton (codiaeum) and keep it vivid.

Croton and codiaeum: what is this plant

The houseplant sold as “croton” is botanically Codiaeum variegatum, an evergreen shrub of the spurge family from the tropics of South-East Asia and the Pacific islands. The true genus Croton is a different group of plants, but the name stuck in the trade. In the wild codiaeum reaches 2–3 m; indoors it is usually 50–120 cm. Its flowers are inconspicuous sprays, often removed so the plant does not waste energy on them.

Popular varieties

• Petra — broad oval leaves with yellow, orange and red veins; the most common variety.
• Mammy — narrow, twisted leaves in burgundy-red tones.
• Zanzibar — very narrow, arching leaves in every autumn colour.
• Gold Dust — green leaves speckled with gold.
• Excellent — three-lobed, oak-like leaves.

Light is the key to colour

Croton is one of the most light-hungry houseplants. It needs very bright light — a south, east or west window, with light shading from midday summer sun. In part shade new leaves come out green and old ones fade. A grow light helps in winter. Keep it at 20–25 °C, never below 16 °C, away from cold sills and draughts.

View full-size photoCroton leaves develop vivid colours with sufficient light.

Watering and humidity

Keep the soil evenly moist: water with tepid, rested water when the top 1–2 cm are dry. Both a dried-out root ball and waterlogging cause leaf drop. Croton needs high humidity, 60% or more: mist the leaves, use a pebble tray and wipe the leaves weekly with a damp sponge, which also deters spider mites. Feed every 2 weeks from April to September.

Why croton drops its leaves

• Being moved — croton gets used to its spot, so leaf drop after purchase or a move is typical. Find a bright place and leave it there.
• Cold and draughts — temperatures below 16 °C or an open window.
• Drying out or overwatering — leaves wilt or yellow, then fall.
• Dry air and spider mites — pale speckles and fine webbing under the leaves.

More in houseplant problems and symptoms.

Repotting and pruning

Repot young crotons every spring and mature ones every 2–3 years into a pot 2–3 cm larger, using rich, free-draining compost with perlite. Prune in spring to encourage branching; cuts bleed milky sap — blot it and dust with charcoal. See how to repot houseplants.

View full-size photoCroton cuttings are rinsed to remove milky sap before rooting.

Propagation from cuttings

1. In spring take a 10–15 cm tip cutting.
2. Rinse the sap off the cut with warm water and let it dry for 1–2 hours.
3. Dip in rooting hormone and plant in a peat-perlite mix.
4. Keep under a clear cover at 24–28 °C, ideally with bottom heat.

Rooting takes 4–6 weeks. Large plants can be air-layered.

Careful: croton sap is toxic

Like most spurges, croton has irritant milky sap. It can irritate the skin and, if swallowed, cause burning and stomach upset. Croton is toxic to cats and dogs, so keep it away from pets and children and wear gloves when pruning. More colourful foliage plants: foliage houseplants; browse potted plants.

FAQ

Why are my croton’s leaves green?

Too little light. New leaves only colour up in bright light — move it nearer a window or add a grow light.

What if croton drops leaves after I buy it?

Nothing drastic: keep it in a bright, warm spot with evenly moist soil and good humidity. New leaves usually appear within a few weeks.

Can I keep croton in a child’s room?

Better not: the sap irritates skin and is harmful if swallowed.

Author: Maria Svitlovir

Graduated from Taras Shevchenko National University of Kyiv, Institute of Biology and Medicine (2001). BSc in Biology, MSc in Horticulture. Writes about plants, works at a garden centre selecting and repotting plants, and contributes to plant reference guides.

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