Bush Aster aka Rice Button Aster
aster dumosus 

days to maturity:
plant spacing: 1 plant per square foot
sunlight requirements: 6-14 hours
look out for: nothing!
harvest notes: not edible 
season:
perennial

This native wildflower may not look like much in its pot but once it settles into your wildflower landscaping and starts profusely blooming and spreading you'll wonder how you ever lived without it. Bush Aster is technically a short lived perennial and it spreads easily by root suckering, making it a perfect meadow species for your yard. It attracts many butterflies and bees with its light purple blossoms and it is a larval host plant for the pearl crescent butterfly.