powdery mildew
Its fronds grow in a clumping
Prune in late winter or early spring to shape the tree and encourage vigorous blooms
One of the highest rated of the Siberian Iris
Fertilome Triple Action Attracts|Butterflies & Hummingbirds powdery mildewFor control of insects, diseases and mites on vegetables, fruits, nuts, herbs, spices, roses, flowers, and shrubs around the home. Insects & Diseases Controlled: Beetles, Mites, Loopers, Webworms, Tent Caterpillars, Armored and Soft Scales, Mealybugs, Psyllids, Whiteflies, Aphids. Diseases: Powdery Mildew, Rust and many others listed on the label.