Euphorbia umbellata Rubra

Euphorbia umbellata Rubra is a red-green coloured form of the species Euphorbia umbellata, also known under the older name Synadenium grantii or commonly as gum tree. In English, it is often referred to as African Milk Bush. The original species comes from East Africa, especially from the Zambezi River valley and the regions of Malawi, western Kenya, and Uganda, from where it later spread to other tropical and subtropical areas. The Rubra form is cultivated mainly for its striking leaf coloration.

The leaves are large, fleshy, and distinctly coloured in a combination of green, yellowish, and deep red to burgundy tones, with colour intensity varying depending on light conditions. The venation is clearly visible and adds structure to the leaves. The plant has a shrubby growth habit, branches well, and with time can form thicker stems and an upright shape reminiscent of a small tree.

Flowers appear in winter or early spring in the form of small cyathia. They are inconspicuous and do not have ornamental value; in this plant, the main visual interest lies in the foliage.

Euphorbia umbellata Rubra requires a bright to sunny position and a well-draining substrate with even but rather moderate watering. The substrate should not remain waterlogged for long periods. When damaged, the plant exudes a white latex sap, so handling with care is recommended. It is a hardy and undemanding plant that works well as a striking container specimen in bright locations.