About Physostegia virginiana (L.) Benth.
Physostegia virginiana (L.) Benth. is a rhizomatous herbaceous perennial plant that forms clumps of stiff, square stems that grow 2 to 4 feet (0.61 to 1.22 meters) tall. Its leaves are lanceolate in shape and have toothed edges. The inflorescence is a long, dense raceme that holds many tubular pink flowers, which resemble snapdragons. Its open fruit is vase-shaped, and contains four triangular black seeds. In cultivation, it is valued as a good plant for adding late-season flowers to a garden. Growing it in fertile soil results in robust growth and wide spreading, so the plant may need to be staked. Tall growth gives the plant a "tendency toward floppiness", which can be managed with pruning. This species can grow aggressively and come to dominate a landscape.
