2 types of sedums
3 types of Dudleya (succulents)
California rock cress
It’s all experimental. We’ll do updates as the months go by.
On a living roof, the critical place is the bottom: how to keep things waterproof, yet allow drainage. Most roofs I’ve seen look a bit sketchy in this area. Stuff that’ll work for a while, but will need replacing. Anyone got details of long-lasting designs?