Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 2: 426. Courtesy of Kentucky Native Plant Society.
Sunset®: All zones
USDA: 7b-10
Sun Exposure: Sun to light shade
Origin: Europe to China
Growth Habits: Clump-forming perennial, up to 3 feet tall (90 cm), shiny green leaves, 3 to 6 inches across (8-15 cm)
Watering Needs: Prefers a soil constantly moist
Propagation: Seeds
'Mrs. Kendall Clark' - sky-blue flowers with translucent veining
'Summer Skies' - double violet-blue flowers with darker veins and a lighter center
'Purple Heron' - has dark purple leaves
'albiflorum' - has white flowers
Blooming Habits:
White, through pinks and mauves to deeper blues, sometimes veined, in summer, 1 inch in diameter (2.5 cm).
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