(Veronicastrum virginicum) PICTURED
Culver's root has tall, willowy, white spikes that you can see through the rest of the border.
Rattlesnake master(Eryngium yuccifolium)
Rattlesnake master is prized for its seed heads and stately gray-green, 5-foot stalks. This type of structure adds strength to a garden.
Cup plant(Silphium perfoliatum)
I think every garden needs this plant to peep up around the end of August and first of September.