Seen that plant in a french nursery owned by friends ("Pépinière de l'île" on Bréhat). The plant has been bought in an english nursery and is labelled as a lobelia. Not sure at all. Does anyone know that plant ? Thanks for your help. JP
Well, it could very well be one of the tree lobelias from the mountains of Africa (example 1 and example 2)
Many thanks Daniel. You have found the way...By looking on the web after your answer I have found the complete name: Lobelia aberdarica. Not yet got a flower but hoping one day ! http://www.mounttomahbotanicgarden.com.au/plant.asp?id=138