If trees are to be irrigated, they should be given enough water to wet the soil at least 2 to 3 feet deep. The water should be applied in a doughnut-shaped pattern at the drip-line or outer edge of the tree’s branches. It generally takes about 2 inches of irrigation water or rain to soak 2 feet deep. Check the soil 6 to 8 inches deep just outside the drip-line of the trees monthly. If the soil is dry, then water. Keep in mind watering restrictions that may be in effect in your community and follow those guidelines as well. In an effort to preserve water in the dry regions of the country, it is recommended that only the trees with the highest value on the property be irrigated. High-value trees are those that offer substantial shade or those that add a high landscape value to the property. Jeff Schalau, Associate Agent, University of Arizona, and Tom DeGomez, Area Agent and Regional Specialist, University of Arizona