Attached to a garden hose, the Ross Root Feeder will deliver fertilizer and water directly to tree and shrub roots. Adjustable flow rate lever allows light or heavy watering and fertilizing. Ideal for watering during dry periods and preventing loss of water through evaporation. Ross Heavy Duty model #1200D Included are pre-measured refills to provide the correct balance of nutrients: • 10 boxes 10-20-20 Acid Loving Evergreen formula • 7 boxes 25-10-10 High Nitrogen Tree and Shrub formula