Lepechinia hastata - Hawaiian Pitcher Sage
Lepechinia hastata is a rare, showy perennial from the mountains of Hawaii. Almost a salvia, it grows 4' tall topped with airy spikes of tiny magenta flowers. It is spectacular and hummingbirds think it's the bomb.
It shoots up 4 feet tall in late summer, giving the garden a blast of of color when everything else is tired and drab. Blooms last for months, then it self-seeds gracefully. I started with one plant and now have a gathering, neatly spaced.
Sow seeds onto a good compost and cover with a thin layer of grit. They can be planted any time of year, but will come up in spring regardless.