Acid-Loving Root Feeder Refill, 10-20-20. Stops pollution from fertilizer run-off and costly waste of water from evaporation. Ideal for watering during droughts. Fertilizer for all evergreen trees, shrubs and other acid loving plants such as azaleas, camellias and rhododendrons. Deep feeding fertilizer system supplies nutrients at the root level, where the active roots are growing. Encourages deep root development for improved tree and shrub stability.