Knockout Roses are very heavy feeders and require a well-balanced rose fertilizer to keep leaf production and bright blooms. We recommend applying Evergreen Rose Food, 15-12-11, in September to keep your roses blooming well into November.
Apply 1 cup per rose bush monthly throughout the growing season (March thru July and again in September) by spreading evenly around your plant. For best results, water in well or incorporate into your mulch. (Do not fertilize after October 10).