From the ArcaMax Publishing, Gardening Newsletter:
http://www.arcamax.com/news/gardening/s-160445-685428
Plant type: Perennial
USDA Hardiness Zones: 3a to 9a
Height: 18" to 36"
Spread: 12" to 16"
Exposure: full sun
Bloom Color: Purple
Bloom Time: Early fall, Late summer, Mid summer
Leaf Color: Green
Growth Rate: average
Moisture: dry to moist
Soil Condition: Alkaline, Clay, Neutral, Sandy, Well drained
Form: Upright or erect
Landscape Uses:
Border, Foundation, Massing, Seashore, Specimen
Special Features:
Attracts birds, Attractive foliage, North American native, Attracts
butterflies, Suitable for cut flowers, Suitable for dried flowers