About Physostegia virginiana subsp. virginiana
This plant is a rhizomatous herbaceous perennial that forms clumps of stiff, square stems that grow 2–4 ft (0.61–1.22 m) tall. Its leaves are lanceolate with toothed edges. The inflorescence is a long, dense raceme that holds many tubular pink flowers, which resemble snapdragons. The open fruit is vase-shaped, and contains four triangular, black seeds. In cultivation, this subspecies is considered a good plant for adding late-season flowers to a garden. Growth in fertile soil produces robust, widely spreading plants that may need staking. When it grows tall, it has a 'tendency toward floppiness' that can be controlled through pruning. It can grow aggressively and come to dominate a landscape.
