Euphorbia royleana is a deciduous cactus-like shrub or small tree armed with short prickles along its stems. It grows to 16.5 feet (5 m) tall with stout strunk and many thick fleshy branches with 5-7 thick, wavy, winged ridges armed with pairs of thorns on their margins. Leaves are fleshy, spoon-shaped, 10-15 cm long. The stems become leafless during hot and cold seasons. Flower-heads are yellow-green, 3-4 in almost stalk-less clusters in leaf axils. Fruit is 3-lobed, about 1 cm across.
It is a medicinal shrub used in Nepal, locally known as siyuri or siudi.
Euphorbias need well-draining soil and lots of sunlight. They are not particular about soil pH, but they cannot tolerant wet soil. Unlike most succulents ,Euphorbia does not handle long periods of drought well. It may need weekly watering during the summer. If you are growing them in containers or your soil is poor, feed with a half-strength fertilizer monthly.
Best used to add vibrant and unique colors to the landscape .Ideally suited for hedging.
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.
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