Bee Balm Plant Leaves Turning Black. Wet soils heavy rains and powdery mildew can result in yellowing foliage. Although powdery mildew is not usually fatal to the flower it is undesirable.
Wet soils heavy rains and powdery mildew can result in yellowing foliage. The bee balm might start to show signs of white powdery mildew forming on the leaves and flowers if the plant doesnt get enough air especially after heavy rains. Bee Balm is another name for Horsemint.
06062008 Everywhere the fungus touched the plant the leaves looked withered and eventually turned black.
Or replace this plant with a more mildew. To prevent bacterial leaf spot keep the plant in a well-ventilated area exposed to the amount of sunlight it needs. 12072015 Bee Balm problem leaves plants yellowing bloom User Name. The plant is about three times as wide as it was but not much taller.