Why Winter Fertilizer Makes Sense—Even If the Lawn Doesn't Seem to Be Growing
The question keeps coming up: Why should a winter fertilizer be used at all after fall fertilization? After all, the lawn barely grows in the winter—so why do it need additional nutrients?
This article explains why winter fertilizer is by no means unnecessary, how it works, and why it plays a crucial role in ensuring a healthy, thick lawn in the spring.
1. The lawn is alive—even in winter
A lawn is a perennial crop. Grasses do not completely cease their activity in winter. Whenever there is no frost, important processes continue—even if you can hardly see any growth above ground:
Root growth occurs especially at cool temperatures
Photosynthesis continues on mild days
Metabolism, glucose production, and energy expenditure remain active
All of these processes require nutrients.
The big problem in winter: Soil life is dormant. Microorganisms and bacteria are barely active, so there is no natural supply of nutrients from the soil.
2. Why fall fertilizer alone is not enough
Fall fertilizer, which is usually applied in October or November, prepares the lawn very well for winter. However, its effects are temporary:
Ammonium nitrogen is effective for only about 6–7 weeks
In December and January, the plant-available nutrients in the topsoil are usually depleted
Nutrients migrate into deeper soil layers (below 30 cm)—where grass roots can barely reach
The result:
The lawn is beginning to deplete its own reserves. However, these reserves are crucial for frost hardiness, health, and a strong start in the spring.
3. What a winter fertilizer does
A winter fertilizer is specially formulated for the period from November through February—even during cold nights or when there is snow.
A continuous, gentle supply of nutrients
The combination of nitrogen, potassium, and sulfur trioxide provides the lawn with the nutrients it needs without stimulating unnecessary growth.
The lawn stays well-maintained without becoming "soft."
Protection Against Diseases
Snow mold and other fungal diseases are particularly common in winter.
The iron content:
has a disease-preventing effect
reduces moss growth
promotes a stable, green color
Protection Against Frost Stress
Potassium helps with:
thicker cell walls
greater frost resistance
more resilient plant structures
Supporting Root Growth
Especially in winter, the root continues to grow as soon as the weather turns mild.
The nutrients are absorbed directly by young root hairs—exactly where they're needed.
4. No risk of unnecessary nutrient loss
Experiments conducted by the University of Hohenheim show:
Nutrient loss occurs only in cases of severe over-application—even on sandy soils.
Normal garden soils also serve as a storage medium.
A winter fertilizer applied in the proper amount is therefore utilized almost entirely.
5. Important Instructions for Use
Do not apply to frozen ground
Air temperature: at least 3–5 °C
Light rainfall after application is ideal for washing in the nutrients
Conclusion
Winter fertilizer prevents the lawn from "starving" during the winter, protects it from diseases, maintains its frost hardiness, and ensures that the lawn starts off strong, thick, and lush green in the spring.
Precisely because winters are becoming milder and milder, winter fertilizer is an important part of modern, sustainable lawn care.
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https://turbogruen.de/products/winterdunger