From the ArcaMax Publishing, Gardening Newsletter:
http://www.arcamax.com/news/gardening/s-160436-781987
Plant type: Perennial
USDA Hardiness Zones: 3a to 8a
Height: 30" to 48"
Spread: 12" to 24"
Exposure: full sun
Bloom Color: Purple
Bloom Time: Early summer, Late summer, Mid summer
Leaf Color: Silvery
Growth Rate: fast
Moisture: moist
Soil Condition: Loamy, Neutral, Well drained
Form: Irregular or sprawling
Landscape Uses:
Border, Container, Rock garden, Seashore
Special Features:
Attractive foliage, Fragrant foliage, Attracts butterflies