Trees growing in a forest or wooded environment do not require fertilization since the soil is typically nutrient rich from fallen leaves and other organic debris. In the urban environment however, there is a lack of natural nutrient recycling as lawn clean-up and tree maintenance typically removes the organic debris from the site. The decomposition of organic matter is essential in providing vital soil nutrients which are necessary for promoting tree health. Trees within the urban landscape can benefit from periodic fertilization when applied properly.

Benefits of Fertilizing Your Trees:

-Maintains tree health and vigor

-Stimulates root growth and early plant development

-Replenishes depleted nutrients

-Improves tree defenses against insects and diseases

-Improves soil structure with organic based fertilizers

-Increases tree’s drought tolerance by increasing water holding capacity of soil with organic based fertilizers

-Aerates and de-compacts soil when an injection probe is used


At Kelly’s Tree Care, all of our fertilizer products contain soluble seaweed along with macro and micro nutrients.  We offer different products to match your tree’s needs whether you have a newly planted landscape tree or an established mature tree.

Deep root fertilization is performed with an injection probe that is inserted into the soil to a depth of 30 cm. The solution is dispersed at a specified pressure which also aerates the surrounding soil. Injection holes are spaced 1 metre apart in a grid pattern under and just beyond the dripline of the tree canopy.

Root drenching is also performed when fertilization is done in conjunction to radial trenching.

Fertilization is most effective when applied either in the spring or late fall.


Decompaction and Aeration 

Compacted soils can have a detrimental effect on the health and vigor of trees.  Root   health and root growth is dependent on the availability of oxygen and water within the surrounding soil environment. When soil is compacted, the air spaces between the soil particles are destroyed which diminishes the efficiency of water penetration into the soil and to the roots. The impact of compacted soil conditions on trees can lead to tree decline, root rot, and the destabilization of the entire tree.

Lawn aeration is a common practice for promoting a healthy lawn.  Similarly soil aeration as a means of decompaction around trees can improve tree health. At Kelly’s Tree Care we use a minimum of a 2.5 cm diameter drill bit and drill to a depth of 30 cm in grid pattern over the root system of the tree. The drill holes sometimes can be filled with peat moss and sand.  This type of soil remediation after construction is highly recommended.