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Hardiness:
USDA Zone 4a: to -34.4° C (-30° F)
USDA Zone 4b: to -31.6° C (-25° F)
USDA Zone 5a: to -28.8° C (-20° F)
USDA Zone 5b: to -26.1° C (-15° F)
USDA Zone 6a: to -23.3° C (-10° F)
USDA Zone 6b: to -20.5° C (-5° F)
USDA Zone 7a: to -17.7° C (0° F)
USDA Zone 7b: to -14.9° C (5° F)
USDA Zone 8a: to -12.2° C (10° F)
USDA Zone 8b: to -9.4° C (15° F)
USDA Zone 9a: to -6.6° C (20° F)
USDA Zone 9b: to -3.8° C (25° F)
USDA Zone 10a: to -1.1° C (30° F)
USDA Zone 10b: to 1.7° C (35° F)
USDA Zone 11: above 4.5° C (40° F)
Sun Exposure:
Full Sun
Bloom Color:
Pink
Pale Yellow
Bright Yellow
Bloom Time:
Mid Summer
Late Summer/Early Fall
Foliage:
Herbaceous
Other details:
Very high moisture needs; suitable for bogs and water gardens
Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)