The family name of the Euphorbia Ingens is Euphorbiaceae and the plant is originally from South Africa. The Euphorbia requires a lot of sunlight. Like to keep the plant dry, only water slightly during the growing season. You can leave it dry for a few days between watering sessions. In the winter even one or two weeks.
It is mistakenly believed that this euphorbia (succulent plant) is a cactus.
If the plant grows too large, you can cut off part of the trunk with a sharp knife. You can replant the cut part in warm moist soil. This way they can regrow roots. Before placing in the soil, let it dry for a few days.