Trees lacking in macro and micro nutrients need to be fertilized. This is a problem that is common in urban trees due to competition. In a typical resident's front yard there are many other plants such as grass and shrubs using the same nutrients that a large tree needs. Organic matter such as leaves are also raked up and hauled away. In a tree's natural environment the leaves decompose and provide nutrients for the tree. One sign of nutrient deficiency are yellowing of leaves. Mature leaves will start to turn yellow than light green as the deficiency progresses. ACE Tree and Landscaping offers deep root fertilization. We get the nutrients where the roots are. Our injection system consists of a pressurized probe that we inject in the soil. The probe shoots out fertilizer for the roots to absorb.