I like 'Theme Master', don't think I'd ever
"like" Johnson Grass. It's pretty, but a bit too aggressive. That
Aster looks like Aster ericoides or Heath Aster. Great plant. I used
to use it as a hedge/border around a wood deck in Fort Collins. Now I just
enjoy it growing along the ditch banks in New Mexico. There is a light
pink cultivar, and another that is tinted blue. Never seen any but white
in the wild.