Bee balm mildew issues
I planted two beebalm this year and they grew to about 2 1/2 feet -3 feet tall and got a few blooms early july. Then the leaves got the white mildew spots on it and now they kinda went dormant and look ugly. Is there any way to reverse this mildew disease or do I have cut them back in the fall and wait til next year? Please help.