Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 540. Courtesy of Kentucky Native Plant Society.
Sunset®: All zones
USDA: 5-9
Sun Exposure: Full sun to light shade
Origin: Europe across to Turkey, Iran and Siberia
Growth Habits: Herbaceous perennial, flower stems can reach up to 6 feet (1.8 m), 18 inches spread (45 cm), spreading rapidly
Flowers: Yellow flowers
Watering Needs: Wetland plant, drought resistant, prefers a slightly acid soil
Propagation: Division of rhizome in early fall
Robert H. Mohlenbrock. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species.
Classified non native invasive plant in a number of states in North America.
Blooming Habits:
Masses of bright yellow flowers from early Spring through to mid-Summer, the date depending on the latitude.
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