Euphorbia stenoclada is an upright much branched large leafless succulent shrub or small tree usually seen around 6 feet tall but capable of growing to 12 feet tall or more by 4 to 6 feet wide. It has new growth that is fairly pliable but hardening into rigid flattened blue-gray to silver stems with spines at the tips.
With age it can develop into a gnarled trunk small tree with a rounded head of spiny growth. The flowers, which technically are called a cyathium (plural cyathia) include a bracts, nectar glands, groups of reduced male flowers and a reduced female flower, appearing in spring are small and dark reddish purple and held at branch tips followed by small rounded green lightly hairy fruit.
It is an easy species to grow that is suited for any well drained soil in full sun. But young plant are happy growing indoors, where they can easily reach the ceiling.
Give the plant an airy growing medium which mainly consists of non organic material such us clay, pumice, lava grit, and only a little peat or leaf-mould.
Water regularly during the active growing season. No water should ever be allowed to stand around the roots. Keep almost completely dry in winter. If plant becomes very red, this is a sign that the roots have not developed properly. It can tolerate moderate shade, and a plant that has been growing in shade should be slowly hardened off before placing it in full sun as the plant will be severely scorched if moved too suddenly from shade into sun. .
It makes an excellent and impenetrable barrier. It is a moderately fast grower, and will quickly become large landscape masterpieces in just 3-5 years.
The plant is poisonous and skin contact with the sap can cause blistering.
For watering cacti, the golden rule is to make sure the soil is completely dry before watering! This will stop the roots from rotting. It is advised to always use a pot with a drainage hole so that excess water can get drained out. If kept in a sunny area, you will need to water it once every week. If it is in a semi shaded or filtered light area, you might need to water it once in 2 weeks.
Cacti like soil that is well aerated and fast draining. You can fertilise the cactus in the summer months when it is in its growing season. During the winters it is best to cut back on any fertiliser and let the plant rest.