Q.end of season sale “Shasta Daisies” are rotting
I bought them in bad shape and rootbound. But once I planted them, they seemed to be doing fine. Now some of the plant’s leaves are looking black and wilted, almost like it’s rotting. HELP!

Most likely over watering - Are the daisies planted close together? Mine still do the same because they multiply like rabbits!
I've given a bunch away, and transplanted even more...each year they keep popping up!
ALWAYS remove the yellow/spotted leaves ASAP - could be mold which spreads. I cut down to about 6" in fall, then in spring when they show signs of growth start dividing! PS - mine grow in sun and shade, and can get very tall!
Hope this helps!