Established trees do not need to be fertilized to maintain their health. Because their root systems grow into fertilized shrub beds and lawn areas, trees in a maintained landscape usually receive enough nitrogen fertilizer for moderate growth. In most instances, additional fertilizer is not necessary to maintain healthy trees. If micro-nutrient deficiencies occur, they can be treated with an application of minor elements. They provide no benefit to the tree.
Some research indicates that wound dressings actually promote decay in certain situations.
If pruning paints or wound dressings are to be used for cosmetic purposes, apply only a very thin coat. Only proper pruning practices prevent wood rot. My St. Augustine lawn is full of carpet grass. Carpet grass, as it is commonly referred to, is actually Blanket Crabgrass. This annual weed can be a real problem in many home and commercial lawns.