Elecampane Inula helenium
I decided I'd like to have this plant in my garden when I first saw it at Chatsworth Gardens, Derbyshire, but didnt know its name. I saw it again today at Chester Zoo where I learnt its name - Elecampane Inula helenium. But its other names are Elf Dock, Elfwort, Horse-elder, Horseheal, Scabwort & Wild Sunflower.
Im wondering what this plant is like to grow, and how does it behave? And where I can buy some seeds?