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Hi Jean-Patrick,Pouzzolane appears to be some sort of scoria or other volcanic material - was it dug in or just used on the surface of the bed? The Tropaeolum seems to be enjoying it!cheersfermi
The Royal Botanic Garden in Edinburgh posted these photos on facebook of Tropaeolum polyphyllum expanding over the Rock Garden in RBGE - it looks to have ambitions to take over Edinburgh! First, a close-up of the golden flowers (Attachment Link) and here is some of the spread! (Attachment Link)