Transplanted trees should receive one good soaking of water per week.
NEWLY MOVED TREES REQUIRE CARE & ATTENTION
WEEKLY WATERING IS CRITICAL
The most common cause of poor health in newly moved trees is lack of water, so the most important thing you can do for your trees is make sure they receive the right amount of water at the proper frequency during the growing season. (During the winter months, trees are dormant and the ground is often frozen, so water care is typically not a concern at this time.)
Trees should receive one good soaking of water per week via a garden hose set on a low stream for a couple of hours. Avoid daily watering because it discourages deep root growth. Use mulch around the base of the tree to retain as much moisture as possible.