In this video, Dr. Dan Herms, Vice President of Research and Development at the Davey Institute, shares why we should fertilize trees.When trees have a nutrient deficiency, we try to correct that by mimicking the soil environment found in a natural forest setting. And in our backyards, we often collect the leaves, twigs, and fallen bark which disrupts the recycling of the nutrients.
Also, we often plant trees in tight places and surround them with turf grass which can outcompete the tree for nutrients.
Symptoms of nutrient deficiency may include:
*Shorter than normal annual twig growth.
*Undersized leaves.
*Dead branches and branch tips.
*Leaf veins darker than leaf margins.
*Leaves with abnormal color.
The type of fertilizer you decide to use is important. We use formulas designed to slowly release nutrients steadily over time. This mimics the natural cycling of nutrients in the forest.
We also use different formulations for different regions. Our goal is to mimic the natural environment.
At Davey, we promote a proactive approach to tree and plant health care and include the basics such as proper watering, mulching, pruning, and pest and disease management. We also look at how the soil impacts the health of your trees, and tree fertilization is an important part of that conversation.
Nutrition management through fertilization is only one component of holistic soil care, which includes improving soil structure by addressing compaction, soil organic matter, and other issues.
Tree fertilization has its value as part of a plant health care program. It can be nuanced and it’s important to understand the science behind this topic.
Contact your local professional arborist who has the knowledge based on your specific location and property.
Visit for additional tree fertilization resources.
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