Water is the single most limiting essential resource for a tree's survival and growth. Most of us understand the need to water trees during dry times, especially in the landscape. But what we often forget is that a tree can also be harmed by too much water. Unfortunately, the symptoms for a water-starved tree can be the same as symptoms caused by water-logged tree roots.
Symptoms for both under-watering and over-watering are wilted and scorched leaves. Both conditions can prevent tree roots from effectively transporting water to the top of the tree and that tree will express these symptoms. In addition, too much tree water can also shut down sufficient oxygen to the roots. Some tree species can handle "wet feet" but many trees can not.