Common Name: Culver's root
Type: Herbaceous perennial
Zone: 4 to 8
Height: 3.00 to 4.00 feet
Spread: 2.00 to 3.00 feet
Bloom Time: May to August
Bloom Description: White with pink stamens
Sun: Full sun
Water: Medium to wet
Suggested Use: Rain Garden
Tolerate: Wet Soil
Easily grown in average, medium to wet, well-drained soil in full sun. Tolerates light shade (and appreciates some afternoon shade in the deep South), but tends to flop and require support if grown in too much shade. Soils should not be allowed to dry out. Usually takes several years to establish itself in the garden. Deadhead spent racemes to extend bloom period. Cut back plants after flowering to basal growth to stimulate new foliage growth and possible late summer or fall bloom.
This Culver's root cultivar is noted for its pure white flowers. It is a large, erect perennial which typically grows to 4' tall when in bloom. Resembles a large veronica, except its lance-shaped leaves are in whorls (3-7 leaves per whorl) on the stems rather than opposite. Dense, slender spikes (racemes to 9" long) of tiny, tube-like, pure white flowers with pink stamens open from the top down in late spring to early summer atop strong upright stems. Blooms can extend well into the summer. Smaller, branching, erect, lateral racemes give this plant a candelabra-like effect when in full bloom. The species is a Missouri native plant which occurs in open woods, thickets, moist meadows and prairies throughout the State. Species roots have been used medicinally as a cathartic and emetic. Common name is in reference to a 17th-18th century American physician named Culver.
No serious insect or disease problems. Seldom needs staking, but may need some support if grown in part shade.
Tall flower spikes provide a strong accent and good vertical height for borders, cottage gardens or wild gardens.