Make sure your evergreens and other acid-loving plants are healthy and thriving all season long with Ross root feeder refills for evergreens. Use refills in your Ross root feeder to get the perfect balance of nutrients directly to plants roots - while you water at the same time. With other fertilizers, you don't know how much of the fertilizer is actually reaching your plant. The refills are specially formulated for acid-loving plants such as evergreens, azaleas, magnolias and many others. Ross premeasured refills make for fast, easy and mess-free fertilizing.