Euphorbia polyacantha is native to northeast Africa, with a distribution range that includes Ethiopia, Eritrea, Yemen, Somalia and Sudan. The shrubby spurge, which grows up to 1.5 meters in height, is commonly known as Fish-Bone Euphorbia.
How to care for the Fish-Bone Euphorbia
Ideally, Euphorbia polyacantha should be placed where it receives sunlight for at least four hours a day. As a prairie inhabitant, Euphorbia polyacantha also copes well with the hot summer sun.
Oversummering in the garden or on the balcony is possible, but should preferably only be done as long as the temperatures are not permanently below 50 °F (10 °C).
As a substrate, mineral or semi-mineral mixtures based on pumice gravel or lava gravel are suitable.
If Euphorbia polyacantha spends the summer on the balcony or in the garden, these substrates are more suited, so that rainwater can drain away well.
For year-round indoor culture can also be used cactus soil from the garden center, which is loosened with clay granules.
It is important when watering that the substrate is allowed to dry out between waterings.
From spring to fall, watering can be done deeply. Water until the substrate is saturated with water. What runs off into the saucer should be removed after a few minutes.
In winter, watering is done only in small sips, then Euphorbia polyacantha stops growing and does not form light deficient shoots.
Wintering can be done temperate at 50 to 59 °F (10 to 15 °C). However, it is also possible at room temperature.