Deep root fertilization is a specialized process where we inject a high quality nutrient solution directly into the root zone of trees. The materials are injected into the root zone under pressure which helps aerate or provide much needed oxygen to the root system. The soil injection begins just below the surface and goes to a depth of 12 – 14 inches. Soil injection sites are placed about 2 or 3 feet apart in a grid pattern throughout the canopy area and beyond the drip line.

Fertilization is an important aspect of tree care. Trees require certain nutrients (essential elements) to function and grow. Urban landscape trees can be growing in soils that do not contain sufficient available nutrients for satisfactory growth and development. In these situations, it may be necessary to fertilize to improve plant vigor.

Fertilizing a tree can improve growth; however, if fertilizer is not applied wisely, it may not benefit the tree at all and may even adversely affect the tree. Mature trees making satisfactory growth may not require fertilization. When considering supplemental fertilizer, it is important to know which nutrients are needed and when and how they should be applied.

Soil conditions, especially pH and organic matter content, vary greatly, making the proper selection and use of fertilizer a somewhat complex process. When dealing with a tree that provides considerable benefit and value to your landscape, it is worth the time and investment to have the soil tested for nutrient content. Tree Works can arrange to have your soil tested and can give you advice on application rates, timing, and the best blend of fertilizer for each of your trees and other landscape plants.

Mature trees have expansive root systems that extend from 2 to 3 times the size of the leaf canopy. A major portion of actively growing roots is located outside the tree’s drip line. It is important to understand this fact when applying fertilizer to trees as well as turf. Many “off the shelf” lawn fertilizers contain weed and feed formulations that may be harmful to trees. For instance, when applying a broadleaf herbicide to turf, it is important to remember that tree roots coexist with turf roots. The same herbicide that kills broadleaf weeds in your lawn is picked up by tree roots and can harm or kill your broadleaf trees if applied incorrectly. Understanding the actual size and extent of a tree’s root system before fertilizing is necessary to determine how much, what type, and where to best apply the fertilizer.