Keep your plants happy and healthy with Richgro Black Spot & Fungus Killa. Designed to protect ornamental plants including roses from a range of fungal diseases, once taken up by the plant's roots this systemic fungicide works from the inside for up to two months to control and prevent black spot, rust, powdery mildew and more. Because it's applied dry, there's no risk of overspray or of harm to beneficial pollinators - and as an added bonus, the formula includes iron and zeolite which act as plant health boosters.