Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 2: 711.
Sunset®: 1-9,14-24,31-43
USDA: 4-9
Sun Exposure: Full sun to part shade
Origin: Europe, western Asia
Growth Habits: Herbaceous clump-forming perennial, up to 3 feet tall (90 cm), 18 inches spread (45 cm)
Watering Needs: Regular water, quite tolerant, but prefers a moist soil
Propagation: Spreads by underground roots, division in spring, cuttings, seeds, can become invasive if not controlled
'Alexander' - is a cultivar with white leaf margins. It is less root invasive than the type. It was introduced by Mrs Alexander from York, England.
Blooming Habits:
Star-shaped yellow flowers, 1 inch across (2.5 cm) in late spring.
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