Rose and Flowering Fertilizer for use in the Ross® Root Feeder (Model 1200C). High Bloom 15-25-10 formula promotes strong blooming and flowers. Use one refill for every 2 ft. of height or width on newly planted shrubs. Use one refill for every 2 ft. of height or width on established roses. Use one refill for every 2 ft. height or width on flowering shrubs.