Echinacea purpurea 'White Swan', 'White Lustre'
Common name: Coneflower
Family: Asteraceae, Aster
Height x width: 2-4' x 2'
Growth rate: moderate to fast
Foliage: dark green, alternate, simple, often clasp the stem
Flowers: white, slightly reflexed petals surrounding yellow cone center; 'White Lustre' supposedly has a more bronze-orange center, but I notice little difference in my gardens. White Lustre does have more horizontal white ray florets, and being vegetatively propagated tends to be more uniform.
Hardiness: zones 3-4 to 8
Pests and problems: seldom a problem outdoors, but occasionallyfungal leaf spots, virus, mites, aphids, thrips
Landscape habit, uses: borders, native meadows, butterfly gardens
Other interest:very attractive to butterflies, genus name from prickly lower stem resembling a hedgehog (Latin echinos), popular for medicinal use from vitamin C supplement to colds to other attributed uses, good cut or dried flower (cone); good winter effect
Other culture: readily self sows
Propagation: seed, division
Sources: many seed catalogs, garden stores, perennial catalogs and nurseries