How often should I water my japanese maple tree?
Several factors affect how much water a Japanese maple tree needs such as environment and season. For example, a tree in a humid environment will need less water than a dry environment and in the summer trees need more water than they do in the winter due to heat and sun.  A good rule of thumb is to water the tree when the soil becomes dry in the top 1-2 inches of the soil. To test how often to water in any given season, water the tree thoroughly and check it daily by poking your finger into the soil to test for dryness. Once dry, water again. You may find that in hot summer months, you need to water your tree 2-3 a week, while in the winter, watering may be required much less frequently. 

Pay attention to your tree and monitor it for signs of over or under-watering. If you notice yellowing or spotted leaves these may be symptoms of poor health. To give your tree the best care for your area and environment, consult a local nursery on the best way to properly care for your tree. 