Aster novi-belgii is a rhizomatous species with rich violet or blue flowers. Flowers form densely packed clusters and bloom in the early fall. Grows best in full sun to partial shade in moist to wet soils. Attractive to butterflies.
AKA Symphyotrichum novi-blegii
For more information on this plant, visit the USDA PLANTS Database: http://plants.usda.gov/java/profile?symbol=SYNON