White Swan coneflower is, as its name implies, a white-flowered version of purple coneflower (Echinacea purpurea). It boasts all the attributes of the species: long bloom time; bold, showy flowers that feed bees and butterflies; textural seed heads that attract American goldfinches and other songbirds. Additionally, White Swan coneflower has proven to be a reliable repeat performer, while other non-purple varieties often disappear or peter out after their first year. White Swan also retains its white color well, while other white versions can become muddy or dingy.
Common name: White Swan coneflower
Botanical name:Echinacea purpurea ‘White Swan’
Exposure: Full sun to part shade
USDA Zone : 3-8
Season: Early or midsummer through autumn, for flowers
Flowers: White Swan coneflower offers a heavy, prolonged bloom of daisy-type flowers up to 4 inches across. 
Foliage: As is typical of Echinacea purpurea, this coneflower variety has deep green, stiff, slightly hairy leaves that taper to a point.
Habit: ‘White Swan’ grows between 2 and 3 feet tall with a spread of about 18 inches. 
Origins: The species Echinacea purpurea is native to open woods and meadows of the southeastern United States .
How to grow White Swan coneflower: Plant this perennial in full sun to part shade, in soil with average fertility and good drainage. .Provide water during dry spells in the growing season of the first year, but once established coneflower is tolerant of drought, as well as heat and humidity. White Swan coneflower can be propagated by division every few years (in spring) or from seed. It may also self-sow around the garden if the seed heads are left standing (and the goldfinches don’t devour all of the seeds).  Leave the spent foliage standing in the fall and remove it in early spring.