Rose Food: Do I Need To Feed My Roses? Feed Roses every 2 weeks with Fertilome Rose Food, which feeds the plant, and kills the insects. If organic gardening is your thing, use Fox Farm American Pride Super Premium Fertilizer, it is exceptional for roses. In spring, apply Bone Meal (this will enhance color and quality of the blooms). For more on Rose Care follow this link to visit Advice You Can Grow with, a blog from San Juan Nurseries, Inc.!