Sun or light shade
Late spring - early summer
Widely tolerant as long as not soggy
24 to 36 inches
Zone 3. Native to eastern United States
Mixed beds, specimen, butterfly gardens
A very 'durable' plant that should be more widely used. Long lived, pest free, low maintenance. Foliage remains attractive all season and turns golden in fall. A favorite of swallowtail larvae in my garden.
This is a native species that I am seeing a lot more in catalogs. It was also featured several years ago in Minnesota Horticulture. Well- established plants reach 2 to 3 feet in height and form a clump 18 to 24 inches around. The flowers appear in early summer and are a lovely shade of pale blue. They make good cut flowers but the ends of the stems must be seared to prevent "bleeding."