Named after an American physician, Siberian Culver’s root is native to northern Asia. It grows to about 5 feet tall and 3 feet wide with lance-shaped leaves that surround the stems. Dense spikes of tiny lavender flowers open from the top down from July to September on strong, upright stems. Smaller, branching lateral spikes create a candelabra-like effect when in full bloom. Easy to grow, it prefers moderate to moist, well-drained soil in full sun. A good background plant in the perennial bed, it is attractive to butterflies.