Erigeron pulchellus
Robin's Plantain
New to me this year, grown from seeds from Prairie Moon Nursery https://www.prairiemoon.com/erigeron-pulchellus-robins-plantain-prairie-moon-nursery.html
I think that this low growing species has great potential for filling the groundcover role gardens.
Please check out the Prairie Moon listing at the link above for more details.
Photos by Salicyna, Bouba at French Wikipedia and U.S. Fish and Wildlife Service Southeast Region via Wikimedia Commons