Dahlias stopped opening
I bought Dahlias from a garden center that were grown in a pot. I planted them in a barrel container along with several other plants. For about a 6 weeks they looked beautiful. They kept blooming and blooming. I pinched the spent flowers off and they continued to bloom. Well now the plant is producing a lot of buds but none of them are opening. Instead of a flower emerging, it turns black. It looks rotten. I don't see any bugs, but something must be eating them. Does anyone have any idea what I should do?