How to properly fertilize fruit trees: For healthy trees and a bountiful harvest

Fruit trees provide delicious and healthy fruit year after year. However, to keep them healthy and reliably bearing fruit, a certain amount of care is essential. In this article, you'll learn how to properly care for fruit trees. fertilize, what matters throughout the year and how to avoid typical mistakes.

Why fruit trees have special nutrient requirements

Fruit trees produce new fruit every year. In doing so, they continuously deplete the soil of nutrients. With each harvest, some of these nutrients are permanently removed from the system. Therefore, fruit trees rely on a targeted supply of nutrients to remain healthy in the long term. By supplying nutrients, you can influence the yield over time.

What nutrients do fruit trees need?

Fruit trees need three main nutrients for healthy growth:

• Nitrogen (N): Promotes the growth of shoots and leaves. However, too much nitrogen can inhibit fruit formation.
• Phosphorus (P): Important for flower formation and fruit development.
• Potassium (K): Strengthens the tree's resistance and improves fruit quality.

Trace elements such as magnesium, iron, and calcium also play a role, especially in older or weakened trees. The crucial factor is not a single nutrient, but the correct balance.

When should you fertilize fruit trees?

The timing is crucial for the effectiveness of fertilization.

• Spring (main fertilization): The most important fertilization takes place between March and May. During this phase, the tree begins its growth period and has the highest nutrient requirement.
• Early summer (if needed): Light fertilization may be beneficial if the tree appears weak or the soil contains few nutrients.
• Late summer and autumn (use sparingly): Nitrogen-based fertilizers should be avoided now. They can cause the tree to sprout new growth and thus become susceptible to frost.

If you'd like to delve deeper into the course of the year, also read our article on the topic. Fertilizing trees throughout the year.

Which fertilizer is suitable for fruit trees?

Basically, a distinction is made between organic and mineral fertilizers. We generally recommend...to use organic fertilizer. Organic fertilizer not only provides the necessary nutrients in the short term, but also improves the soil and soil life in the long term. Examples of organic fertilizers include:

• ripe compost
• Worm compost
• Horn shavings
• well-rotted manure
  

Mineral fertilizers, on the other hand, work faster, but should be used sparingly and in a targeted manner. Incorrect application can damage the soil in the long term. You can find more information in our introductory text on the topic. Fertilizing trees.

Fertilizing and watering: Why the two belong together

Fertilization is only effective if the tree has sufficient water. Water is the environment that enables biochemical reactions. Without water, the nutrients are of little use to the trees. Water requirements are particularly high during fruit development. Drought stress can cause fruit to remain small or fall off prematurely.

If you'd like to learn more about how to best care for your trees, also read our article. Water trees properly.

How do you fertilize fruit trees correctly? 

For fertilization to have its full effect, it depends on proper application.

• Check the soil: Is it dry or compacted?
• Lightly water the soil beforehand if necessary.
  
• Distribute the fertilizer evenly in the outer crown area.
• Work it lightly into the top layer of soil.
• Then water thoroughly

Important: The fine roots through which the tree absorbs nutrients are located primarily in the outer part of the tree canopy, not directly on the trunk. Therefore, distribute the fertilizer generously throughout the entire root area.

Typical mistakes when fertilizing fruit trees

Here are the most important mistakes:

• Too much nitrogen leads to strong leaf growth but weak fruit production.
• Wrong timing: Fertilizing too late can lead to new shoots that cannot develop properly before the frost.
• Dry soil: Without water, nutrients can only be absorbed to a limited extent.
• Uneven distribution: The fertilizer should not be applied in spots, but over a larger area.
• Lack of soil care: Compacted or unprotected soil significantly reduces the effectiveness of fertilization. Therefore, the following is also suitable as a supplementary measure to fertilization: Mulch.

Natural methods for soil improvement

Besides traditional fertilizers, there are sustainable ways to improve soil quality in the long term:

• Mulch protects the soil from drying out and supports soil life
• Compost continuously provides nutrients
• biochar can increase the storage capacity of nutrients

These measures take effect more slowly, but contribute significantly to the long-term health of your fruit tree.

The tree bath worm compost tree fertilizer

Summary: How to properly fertilize fruit trees 

It is not the quantity that matters, but the interplay of:

• suitable fertilizer
• right time
• adequate irrigation
• and healthy soil structure

If you want to support your tree holistically, it's worth paying attention to the water supply in addition to fertilization. 

Plant fruit trees

Are you still looking for the perfect fruit tree? In this article you will find the Best edible trees for the garden: Fruit, nuts & more from your own harvest.