Early to Midsummer
2-5' x 1-2' (60-120 cm x 25-60 cm)
-40°F to -30°F / -40°C à -34°C (USDA Zone 3)
Plants produce several stiff, upward arching stems, each of which carries a large, crowded display of showy pink-purple flowers in summer that are highly attractive to butterflies and other pollinators. Prefers full sun and moist, fertile, well-drained soils. Tolerates some drought after establishing.