This grower is sure of this plant identification.
Aeonium genus (Tree houseleek). These are around 35 species of perennial succulent evergreen shrubs, some of which are short lived. Most of the species grow from autumn to spring and they are semi-dormant in mid-summer. They have rosettes of bright green or blue-green, occasionally purple leaves.
The name comes from the ancient Greek word: 'aionos' which means 'ageless'.
They are frost tender, min 5C and will prefer partial shade and very well drained soil.
Grown for their varying forms and foliage.