Form a 6-inch-high soil dam around the tree at the edge of the hole, then soak the roots with water. Knock down the lip after the water has been absorbed. Add mulch about 3 inches deep all around the tree, but pull it away from the trunk to discourage rot. Keep the roots moist by wrapping a Treegator water bag or two around the trunk. Fill it once a week for the next two years.
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