Regularly remove spent leaves and flowers. Plants that grow too tall can have their trunks pruned. This will stimulate new branches to form
Plants grown indoors will need periods outside to stay healthy, for example 6 months inside then 3 months outside.
Can be propagated. Take stem cuttings, with leaves removed from the lower 300mm and allow to dry out (in a cool place out of direct sunlight) before planting. They will take up to 6 months to establish. Strike cuttings in Spring to Summer. Plants can also be grown from suckers or from seed.
The sap of some species can cause skin irritation.