The spotted yellow leaves are the result of black spot disease. Knock Out roses, in general, are quite resistant (not immune) ...

According to Kevin Lee Jacobs, an experienced gardener and creator of A Garden for the House, cow's milk can be used if your roses fall victim to black spot disease. He said: "A spray composed of ...

Should your roses fall victim to infection, gardener and founder of A Garden for the House, Kevin Lee Jacobs, has disclosed the "smartest" method to control it is with cow’s milk. Kevin ...