Veronicastrum virginicum - Culver's Root

Easily grown in average, medium, well-drained soil in part shade to full shade. Prefers humusy, organically rich, moisture-retentive soils. Soil should not be allowed to dry out. Wet soils, particularly in winter, can be fatal, however. Removal of flower spikes after bloom will improve the appearance of the foliage mound. Foliage is semi-evergreen in the St. Louis area where the amount of retained foliage color in winter, if any, is in large part dependent upon the severity of the temperatures
 
Height: 4.00 to 7.00 feet
Spread: 2.00 to 4.00 feet
Bloom Time: June to August
Bloom Description: White to pale blue
Sun: Full sun
Water: Medium to wet
Maintenance: Low
Suggested Use: Rain Garden
Flower: Showy
Attracts: Butterflies
Tolerate: Wet Soil