(syn: Dahlia imperialis Double Purple) Thanks to customer Larry Depuy for sharing this wonderful form of the giant tree dahlia. We eventually tracked these back to the late California plantsman extraordinaire Wayne Roderick, who introduced a plethora of great garden plants. Since it had no valid cultivar name, we have given it one. The 9' bamboo-like stalks are topped in late October with sprays of 3" anemone-like, lavender double flowers...very spectacular and attractive to hummingbirds if you can hold off the frosts long enough to enjoy the flowers. If not, the stalks are a great structural element in the garden anyway.