Tackle your powdery mildew problem with Miracle-Gro Garden Defense (709ml). Miracle-Gro Garden Defense features a biodegradable formula that composts to a form useful for beneficial microbes and plants. Ideal for diseases like black spot, powdery mildew and rust, this copper fungicide-based spray keeps your foliage and flowers looking healthy and prevents the spread of infection. Safe for outdoor and greenhouse use, this handy treatment spray can be used up to and on harvest day | Miracle Gro Garden Defense Size 1l