Ross Root Feeder Tool Model 102A 10233A 102 Easy Gardener Ross Root Feeder System stops pollution from fertilizer run-off and costly waste of water from evaporationDeep feeding fertilizer system supplies nutrients at the root level, where the active roots are growing; Use With Ross Root Feeder Fertilizer Cartridges (not included)Encourages deep root development for improved tree and shrub stability Contact us about large volume discounts