Piet Oudolf uses this plant on the High Line

Stachys officinalis is a native of European meadows and open woodlands, and grows both in the wild and in cultivation in the Netherlands, home of High Line planting designer Piet Oudolf. The cultivar ‘Hummelo’ was introduced into the nursery trade by Piet and named for his hometown, Hummelo. It’s another sure bet that when a plantsman names a cultivar for his hometown (or wife, or husband, for that matter), it’s a very special plant indeed. Piet selected Hummelo hedgenettle from among many varieties of the species for its neat, compact habit and bold magenta flowers.