Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 20. Courtesy of Kentucky Native Plant Society. Scanned by Omnitek Inc.
Recommended Temperature Zone:|
sunset: All zones
Sun Exposure: Full sun
Origin: Eastern Europe
Growth Habits: Herbaceous perennial, up to 5 feet tall (1.5 m)
Watering Needs: Abundant water
Propagation: seeds, several modern varieties are male cultivars that don't produce seeds and are reproduced by tissue culture