Mold can take many forms, from powdery mildew, which infects roses to gray mold that hits bedding plants. Mold is typically a problem in humid and warm areas with poor air circulation and can be especially problematic in greenhouses. Fortunately, mold is an easy disease to control.
Pick the diseased blooms off of your flowering plants.
Prune entire branches the hold moldy blooms with gardening shears. Disinfect your shears between cuttings using bleach to prevent the mold from spreading.
Spray infected plants with a fungicide formulated for growing plants to kill any remaining mold. Sulpher or copper fungicides are effective.
Replant your flowering trees and shrubs to increase the air circulation between the plants.