Holly-tone The Original Natural & Organic fertilizer for all acid loving plants. The #1 choice for feeding hollies, azaleas, camellias, evergreens, dogwoods, rhododendrons & more! Get more blooms with more vibrant color. Grow larger plants with deeper green color. Long lasting, slow-release feeding with our exclusive Bio-tone Microbes. Available in 8, 18, and 50 lb. bags, 1 pound equals approx. 3 cups.