aka Tall Flat-Topped White Aster
Perennial. White flowers with yellow centers appear in mid Summer to Fall. 
To germinate, needs 60 days cold, moist stratification. Best Winter sown. 
Full to partial sun.
Medium to wet soil. 
Grows 3' - 5' when fully mature. May or may not bloom first year. 
Space plants 1 to 3 feet apart. 
USDA zones 3 to 8