Aeonium, the tree houseleeks, is a genus of about 35 species of succulent, subtropical plants of the family Crassulaceae. Many species are popular in horticulture. The genus name comes from the ancient Greek "aionos".
Aeoniums are odd looking succulent plants, with long, arching stems and rosettes of leaves that can often look so perfect, you might think they were fake. You'd be forgiven if you had to touch one to tell if it was real or rubbery plastic. There are about 35 species, and most are native to the Canary Islands. They prefer a Mediterranean climate—not too hot, not too cold, not too dry. The plants form fleshy rosettes, and you will notice a similarity between Aeoniums and several other succulent plants, most noticeably Echeveria and Sempervivum, the popular Hens and Chicks. Aeoniums can be low growers or branching plants that grow into shrubs.