Source: Ecosystem Science and Management Extension Unit, Texas A&M AgriLife Extension Service
Water is the most limiting factor for tree survival and growth. Trees use water during photosynthesis and lose water during transpiration. Drought conditions can lead to tree decline, making the tree more susceptible to pest problems. Supplemental watering should be part of the tree-maintenance plans, especially during periods of water deficits and in areas where surface temperatures are escalating.