The family name of the Euphorbia Ingens is Euphorbiaceae and the plant is originally from South Africa. The Euphorbia requires a lot of sunlight. Keep the plant dry, only water in the growing season. You can leave it dry for a few days between the irrigation cycles. In winter one or two weeks.
It is wrongly thought that this euphorbia (Succulent plant) is a cactus.
The big difference with a cactus is in the juice inside the plant. Cacti, which live in a dry climate, have a reservoir inside to store moisture in periods of extreme drought. In the case of cacti, that moisture consists of water, whereas in the Euphorbia ingens there is a milky fluid. Hence the Dutch name spurge.
The Euphorbia ingen is originally an African plant while cacti grow in America.
The thorns grow directly from the leaf. In cacti the spines grow on a kind of pillow-shaped nodule or leaf cushion (areool).
If the plant becomes too large, you can cut off part of the stem with a sharp knife. You can replant the cut part in warm moist soil. In this way they can make roots again. Before placing in the earth, let it dry for a few days.
The Euphorbia Ingens is also called a cowboy cactus.