Sprinkle the directed amount of rose fertilizer, found on the label, around the base of each rose bush and evenly spread it out under the entire canopy. You can also use 1/4 cup of balanced fertilizer, such as 12-12-12, per plant. Then, use a rake, garden fork or three-prong weeding tool to lightly scratch the fertilizer into the soil without disturbing the roots.
Water the rose bushes with approximately 1 inch of water near the base of the plants rather from overhead; overhead watering promotes foliar diseases. Water helps settle the fertilizer into the soil.
Fertilize repeat blooming roses, such as Sally Holmes, every four to six weeks until early August, recommends University of Kentucky.