Aeonium arboreum, the tree aeonium,[2] tree houseleek, or Irish rose, is a succulent, subtropicalsubshrub of the genus Aeonium. It is native to the hillsides of the Canary Islands. It bears rosettes of leaves and large pyramidal panicles of bright yellow flowers in the spring. In temperate regions it needs to be grown under glass.[3] The purple cultivar 'Zwartkop' ('Schwartzkopf') has gained the Royal Horticultural Society's Award of Garden Merit.[4] and a variegated form is grown as cultivar 'variegatum'.