Croton

Season note

Water when the top 2 inches of soil are dry; reduce frequency in winter to avoid root rot.

Overwatering signs

Root rot, soggy soil, leaf drop

Underwatering signs

Leaf drop, dull or curling leaves

Light level

bright direct to indirect

Best rooms

Soil

Well-draining potting mix

Humidity

Prefers high humidity (40–60%)

Fertilizer

General houseplant fertilizer in early spring, early summer, and mid-summer only

Temperature range

16°C – 24°C

Croton, botanically Codiaeum variegatum, is native to the tropical regions of Malesia (a botanical region covering Malaysia, Indonesia, and the Philippines), Papuasia (including New Guinea, the Bismarck Archipelago, and the Solomon Islands), northern Australia, and a scattering of Pacific islands including Fiji and Vanuatu. It belongs to the spurge family, Euphorbiaceae, placing it alongside poinsettia, crown of thorns, and cassava as botanical relatives, and like many members of that family, it produces a milky sap that can cause skin irritation on contact. The genus name Codiaeum comes from a Latinized version of "kodiho," the vernacular name for the plant used on the island of Ternate in Indonesia, while the species epithet "variegatum" simply means variegated, a direct reference to the plant's signature multicolored foliage.

Croton's foliage genuinely is among the most vividly colored of any common foliage plant, capable of displaying green, yellow, red, orange, purple, and pink, often several of these colors on a single leaf. This color range exists in nature to some degree in the wild-type plant, which has simpler glossy green leaves in its native habitat, but the extraordinary variety seen in cultivation today is largely the product of extensive breeding, having produced literally hundreds of named cultivars over the decades, each with distinct leaf shapes, colors, and patterns — a diversity substantial enough that the plant is sometimes informally called "the world's most colorful shrub." One well-known relative worth distinguishing is Croton tiglium, sometimes called "purging croton" or "true croton," a different species entirely, historically used to produce a highly toxic purgative oil now considered too dangerous for any medicinal use — a useful reminder that "croton" as a common name covers plants of quite different character depending on species, even though the ornamental Codiaeum variegatum grown as a houseplant is a comparatively much milder toxicity concern. The genus Codiaeum as a whole is relatively small, comprising roughly seventeen recognized species of evergreen shrubs and small trees, with Codiaeum variegatum standing out as by far the most widely recognized and cultivated member thanks specifically to its ornamental value; the genus was first formally described in 1824 by the French botanist Adrien-Henri de Jussieu, with Codiaeum variegatum designated as the type species.