Most Tree Roots Are Within The Top 8" to 12" Of Soil,  And Radiate Outward To Just Beyond The Drip Line.

     Our urban landscape also imposes additional stresses on trees and shrubs that are not a concern in the forest setting. Stress caused compacted soils, air pollution, road salts, poor drainage, and competition with turf grasses can impair the health and ultimately the growth of the tree. Without realizing it, our stressed trees are becoming more and more susceptible to infestation by insects and disease, further compounding the restricted grow. With that in mind, one of the best ways we can help our landscape plants grow healthier and to make them more resistant to pest infestation, is to ensure they receive a proper supply of nutrients.

Deep Root Fertilizer Injection

     This is the most effective method to fertilize trees. This process injects a water and fertilizer mixture under high pressure 8 to 10 inches below the soil surface, right where the feeder roots are. The injections are placed in a grid pattern in and around the tree’s drip line.  There are many advantages to fertilizing this way. The high pressure injection forces the water fertilizer mix throughout the root zone, which not only feeds all the roots, but also reduces soil compaction and encourages additional root zone aeration. Depending upon your plant varieties, and their general state of health, this deep root injection fertilizer technique may be suggested at various times throughout the season, although, spring and fall are generally the best times of the season.


     Even though your trees and shrubs may appear to “look healthy” today, call or email us for an analysis and our recommendations on a Deep Root Fertilization program to help keep them healthy and strong for years to come.

Tree Roots

     Tree roots perform many functions. The Primary roots grow down into the soil to provide the anchor to hold the tree upright. Secondary roots branch off and extend radially and horizontally and form the basis of the moisture and nutrient gathering system for the tree. Tertiary roots are the absorbing roots eventually branch off into clusters of Rootlets, or fine hair like feeder roots. It is these feeder roots, in conjunction with natural mycorrhizial fungi in the soil that break down the nutrients found in the soil, and begin to transport them with the tree system.

Deep Root Fertilizer  Injection Pattern Under The Drip Line of the Crown

Tree & Shrub
Care TipsText Box: Tree & Shrub Fertilization

     While the primary and secondary roots can be found rather deep in the soil, the tertiary and feeder roots will be relatively close to the soil surface. These roots will grow horizontally, to just beyond the outer drip line of the crown or foliage. This is where we must concentrate applying fertilizer for the trees to benefit the most.

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Tree Spraying

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