Borrowed from the bintlog: a picture I took today of Aster oolentangiensis, the sky-blue aster, in my garden.
Another native of Illinois, this prairie plant is a prodigious reseeder. I find new volunteers every year and relocate them to other parts of the garden. Like most of my plants, they are very tippy, and when they fall over onto the lawn or into the garden they look like drifts of pale blue snow. Next year I will try to remember to cut some of them back to see if I can make them more stocky.