Treegator Original 20 Gal Slow Release Watering Bags for Trees 3-PACK by Tree Gator 3 PACK - Slow release watering bags for trees Ideal for newly planted trees with trunks up to 4-inches in diameter Saves trees - deep water saturation helps reduce transplant shock and drought stress Eliminates water waste due to run-off and evaporation; install and fill in just minutes - requires re-filling just once ever 5 to 7 days