USDA Zone 4 (-30°F) to USDA Zone 8 (10°F).
6-8' (2-2.5 m)
2-3 times per week
Huge, cone-shaped flowers make a stunning display in shaded gardens or mixed shrub plantings. Beautiful in flower arrangements, fresh or dried. Acid (sour) soils give best blue flowers. Requires winter protection between zones 3 and 5.