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What is the purpose with the green bag on the tree's bottom part? - tree bag

A bag of "water" (generally a green bag) serves several purposes. The first is to keep it wet the root ball of a newly planted tree. It fulfills this task by a small drop on the floor for an extended period. Normally, a water-bag for a few days. In addition to the tree, the bag also reduces the evaporation rate of water (similar to humus) - Water is less necessary to keep the soil moist. If you live in a warmer climate - water pouch significantly improve the likelihood of a transplanted tree to survive a hot summer.