Fertilizing Trees

April 27, 2015

What are the advantages of fertilizing trees?

Fertilizing trees with low nutrition can increase their resistance from damaging insects, diseases, and other environmental stresses. In most landscapes, leaves are raked from below trees to encourage growing grass. Removing leaves eliminates the nutrient cycle that happens in natural habitats. Fertilizing trees may be necessary to replace those nutrients that are removed from the root zones of trees. Signs of low nutrition in trees are undersized leaves, short new growth on twigs, or yellowish green leaves.

When is the best time to fertilize trees?

The best time to fertilize trees is late April or early May just before they begin to put on new growth, or in late fall after the trees are dormant. This ensures that nutrients are available to the tree during the critical periods of root and shoot growth. Do not fertilize trees between July 15 and dormancy because it could stimulate new growth late in the season that does not have a chance to harden off before winter.

Which trees should NOT be fertilized?

Avoid fertilizing trees that may be stressed by drought conditions during the summer months. Do not over-fertilize trees that are otherwise healthy. Over-fertilization can actually cause the opposite effect and increase problems related to insects, disease, and other stresses. Over-fertilization can also leach through the soil and pollute the ground water.

How is fertilizer applied to trees?

Mike’s Tree Company utilizes a deep root injection probe when fertilizing trees. This technique directs nutrients below competing grass roots and into the root zone of trees, about 6-8 inches below the soil line. Each injection site is spaced evenly underneath the entire canopy of the tree to ensure equal distribution of the fertilizer. We use long lasting slow-release fertilizers that create a balanced feeding throughout the growing season.


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