The Ultimate Guide to Tree Fertilisation: Boosting Growth and Health

May 30, 2023 | Tree Care

I know how important it is to keep them healthy and growing. One of the best ways to achieve this is through tree fertilisation. In this ultimate guide, I will take you through everything you need to know about tree fertilisation. 

Understanding Tree Fertilisation

Tree fertilisation is adding nutrients to the soil around a tree’s roots to improve its growth and overall health. Trees need essential nutrients such as nitrogen, phosphorus, and potassium to grow; when these nutrients are lacking, they can result in stunted growth, poor health, and even death.

Fertilising a tree involves providing the necessary nutrients to the soil to maintain a balanced, healthy environment. The nutrients are absorbed by the tree’s roots and transported to the rest of the tree through the trunk and branches.

Benefits of Tree Fertilisation

Fertilising your trees has several benefits, including:

  1. Improved Growth: Fertilisers provide the necessary nutrients that trees need to grow. When applied correctly, fertilisers can boost a tree’s growth, making it bigger and healthier.
  2. Increased Resistance to Diseases and Pests: A tree that is well-fed and healthy is better able to resist diseases and pests. So by fertilising your trees, you provide them with the nutrients they need to fight diseases and pests and stay healthy.
  3. Enhanced Appearance: Fertilisers can improve the appearance of your trees by making them look fuller, greener, and more vibrant. This is especially important if you have ornamental trees in your yard.
  4. Increased Lifespan: You can increase their lifespan by providing your trees with the nutrients they need to stay healthy. Healthy trees can better resist damage from storms, diseases, and pests, ultimately resulting in a longer lifespan.

When to Fertilise Trees

Knowing when to fertilise your trees is crucial for their health and growth. The best time to fertilise your trees is in the early spring or fall when the tree is actively growing. This is when the tree can absorb and use the nutrients provided by the fertiliser.

It’s essential to avoid fertilising your trees in the summer when the weather is hot and dry. Fertilising during this time can cause the tree to lose water and become stressed, leading to damage or even death.

How to Choose the Right Type of Tree Fertiliser


Choosing the right type of tree fertiliser depends on several factors, including the type of tree, soil type, and the nutrients needed. Therefore, it’s essential to test your soil before choosing a fertiliser to determine what nutrients are lacking.

Once you know what nutrients your soil needs, you can choose a fertiliser that provides those specific nutrients. It’s also important to consider your tree type, as some trees may require different types of fertilisers.

How to Apply Tree Fertiliser

There are several ways to apply tree fertiliser, including:

  1. Surface Application: Involves spreading the fertiliser around the tree’s soil surface. This method is best for trees that have shallow roots and need frequent feeding.
  2. Deep Root Injection: Involves injecting the fertiliser directly into the soil around the tree’s roots. This method is best for established trees with deep roots requiring less frequent feeding.
  3. Foliar Spraying: Involves spraying the fertiliser directly onto the leaves of the tree. This method is best for trees experiencing nutrient deficiencies and needing a quick boost.

Tree Fertilisation Techniques

There are several techniques for fertilising trees, including:

  1. Slow-Release Fertilisers: Provide nutrients to the tree gradually over an extended period. This method is ideal for trees that require frequent feeding.
  2. Liquid Fertilisers: The tree’s roots quickly absorb liquid fertilisers and quickly boost nutrients. This method is best for trees that need a quick nutrient boost.
  3. Controlled-Release Fertilisers: Provide a steady supply of nutrients to the tree over an extended period. This method is ideal for trees that require infrequent feeding.

Signs That Your Tree Needs Fertiliser

If you’re unsure whether your tree needs fertiliser, there are several signs to look out for, including:

  1. Slow Growth: If your tree is growing slowly or has stopped growing altogether, it may need fertiliser to provide the necessary nutrients.
  2. Discoloured Leaves: This can be a sign of nutrient deficiencies. For example, if your tree’s leaves are yellow or brown, it may need fertiliser to provide the necessary nutrients.
  3. Small Leaves: If your tree’s leaves are smaller than usual, it may need fertiliser to provide the necessary nutrients.


Fertilising your trees is essential to tree care that can benefit greatly. You can improve your tree’s growth, health, and appearance by providing the necessary nutrients. However, it’s essential to choose the right type of fertiliser, apply it correctly, and avoid common mistakes.

I hope this ultimate guide has provided you with all the information you need to fertilise your trees and keep them healthy for years to come.

Remember to consult with a professional arborist for expert advice on fertilising your trees. Contact us today to schedule a consultation. The Black Forest Tree Service offers various tree services that you might need. You may check out their website for more information. 

Contact Details:

Trending Articles


Back To Blog

Warning: Undefined property: ET_Core_PageResource::$BASE_DIR in /home/customer/www/ on line 2351