Yes. Watering is vital for establishing newly planted trees and shrubs. However, over-watering is a common mistake that forces oxygen out of the soil around the roots and can lead to death of a shrubs and trees. A good indication of too much water is yellowing of the foliage that develops first on the inside leaves and progresses to outer leaves. Of course, every plant is different, so it is important to find out the correct guidelines for your specific plant. Below are some resources to further assist you with your specific need.