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Height
Spacing
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
Hardiness
9-12 in. (22-30 cm)
12-15 in. (30-38 cm)
Sun Exposure
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
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)
Danger
Full Sun
Bloom Color
N/A
Bloom Time
Blue-Violet
White/Near White
Foliage
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
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Other details
Herbaceous
Propagation Methods
May be a noxious weed or invasive
Seed Collecting
By dividing the rootball
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
Category
Soil pH requirements
Properly cleaned, seed can be successfully stored
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
Patent Information
Foliage Color
Bloom Characteristics
Water Requirements
Perennials
Where to Grow
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