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02.04.2026
In autumn, the growth of most trees slows down as they prepare for their winter dormancy. Many species begin to change the color of their leaves before shedding them later.
During this phase, a tree's nutrient requirements change. While spring and summer primarily focused on budding and growth, autumn is more about bringing the growing season to a successful close and preparing for the coming winter. Therefore, the question arises: Should trees still receive nutrients in autumn? fertilized be?
Why trees need nutrients in autumn
Even though visible growth slows in autumn, important processes continue to take place within the tree. The tree stores nutrients, strengthens its tissue, and prepares for the cold season. Certain nutrients play a key role in this process:
- Potassium strengthens cell structure and increases frost tolerance.
- Phosphorus supports root development
- Organic matter improves soil structure in the long term.
A balanced supply of nutrients can therefore help the tree to get through the winter more resilient.
Be careful with nitrogen in autumn
When fertilizing in autumn, the amount of nitrogen applied is particularly important. Nitrogen promotes the growth of leaves and new shoots. If too much nitrogen is applied in autumn, the tree can produce a strong second flush of growth. However, these young shoots usually don't have enough time to fully harden off before winter. As a result, they are more susceptible to frost damage.
For this reason, we recommend avoiding fertilizers with a high nitrogen content in autumn and using only organic fertilizers.
Organic fertilizers in autumn
Organic fertilizers, which act slowly and improve the soil in the long term, are particularly suitable in autumn. These include, for example:
These materials are gradually decomposed by microorganisms in the soil. The nutrients they contain are then available to the tree over a longer period. At the same time, they promote soil life and improve the soil structure.
Autumn as a good time for soil care
Autumn is a good time to care for the soil around the tree. mulch layer Organic material can help protect the soil and promote soil life. Mulch can fulfill several functions:
- Protecting the soil from drying out
- Compensation for temperature fluctuations
- Promoting microorganisms in the soil
- The slow decomposition process creates humus, which improves the soil's ability to store water and nutrients.
Young trees especially need soil care. Autumn is also a good time to plant a new tree.
Support young trees in autumn
Young trees particularly benefit from good soil care in autumn. Their root system is not yet fully developed and they are more sensitive to drought and nutrient deficiencies. Light organic fertilization can help:
- to promote soil life
- to improve the soil structure
- Making nutrients slowly available
This allows the young tree to start the new growing season with better conditions next spring and to develop well.
Fertilizing and watering in autumn
Even in autumn, water plays an important role in the health of trees. Especially during dry autumn periods, it can be beneficial to water trees occasionally. Sufficiently moist soil helps the roots absorb nutrients and develop further. You can find more information in the article. Watering trees in autumn.
Young or newly planted trees especially benefit from being well watered before winter.
The tree bath worm compost tree fertilizer
The Baumbad liquid fertilizer Based on high-quality worm compost, the natural excrement of earthworms, this product contains a wealth of living microorganisms, humic acids, plant-available nutrients, and growth-promoting enzymes. Baumbad liquid fertilizer is also suitable for use in tree watering bags.
SummaryFertilize moderately with organic materials in autumn.
- Autumn is not the most important time to fertilize trees, but moderate and well-balanced fertilization can still be beneficial. Organic fertilizers are particularly suitable at this time of year, as they have a slow-release effect and improve the soil in the long term.
- It is particularly important to avoid high nitrogen applications and instead focus on soil care and organic matter.
- This strengthens the soil and allows the tree to enter its winter dormancy well prepared.
You can find more information in the article. How do you properly fertilize trees?
Natural fertilization and activation of soil life
The power of the soil
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Trees need nutrients to grow healthily. In many gardens or cities, these nutrients are lacking in the soil, for example, because leaves are removed or the soil is heavily used. Appropriate fertilization can help improve the soil and support tree growth. However, it's important not to fertilize simply "on a hunch," as some soils already contain sufficient nutrients.
Organic fertilizers like compost or worm castings work more slowly, but improve the soil in the long term and promote soil life. Mineral fertilizers work faster, but usually only provide individual nutrients. For many trees, organic fertilization is the more sustainable solution in the long run.
Yes, that can be very helpful. A soil sample can determine which nutrients are present in the soil and which are lacking. The pH value is also measured. This allows you to fertilize the tree precisely and avoid over-fertilizing. A simple soil analysis usually only costs around [price missing]. €20–40.
A nutrient deficiency can manifest itself, for example, through yellow or pale leaves, weak growth or few flowers show. However, similar symptoms can also be caused by drought or compacted soil These problems arise. Therefore, you should always check first whether the tree is getting enough water.
Yes, that's possible. Irrigation bags release water slowly into the soil. When liquid fertilizer is mixed with water, it reaches the root zone evenly. This way, a large portion of the soil around the tree comes into contact with the nutrient solution.
The best time to fertilize is usually in spring and early summerFertilizing is best when the tree is growing and producing new leaves. During this phase, the tree can absorb nutrients particularly well. Very late fertilization in autumn is usually not advisable.
The soil is home to many microorganisms, such as bacteria, fungi, and earthworms. They break down organic matter and make nutrients available to plants. Active soil life therefore helps trees absorb water and nutrients more effectively. Organic fertilizers can support this soil life.
Great idea, easy handling and everything from ordering to delivery.
Michael K.
