GardenPro’s Rhododendron and Azalea fertilizer is blended to promote healthy growth and flowers. With Ascophyllum nodosum kelp to stimulate root growth and enhance resistance to stress and disease. Nutritionally balanced for rhododendrons, azaleas and most acid loving plants such as camellias, holly, hydrangeas, heathers, magnolia, calla lilies, etc. Contains stabilized nitrogen for slow release, long term feeding. With kelp and essential micronutrients.