Helenium Gay-go-Round with Calamagrostis Karl Foerster.

Bronze Fennel (Foeniculum vulgare purpurea) with H Rubinzwerg

Big grasses are effective with heleniums - in these two shots behind are Molinia arundinacea forms and Miscanthus sinensis gracillimus with flowers just emerging on left.

A mixed hot border

Helenium Waldtraut with bronze fennel.