Lawn Fertilizer In The Spring: What Should Be In It

How to fertilize properly is already described in detail in the guide. Here you will learn what ingredients and compositions you should pay attention to when fertilizing. This belongs in the lawn fertilizer in the spring.

  • In spring, lawns make special demands on the composition of lawn fertilizer.
  • ingredients differ in spring fertilization from autumn fertilization
  • timely, correct fertilizing in spring for lush lawn green and higher resistance
  • Nitrogen, phosphorus, potassium, magnesium and sulfur most important ingredients

Best time to fertilize

In order to achieve the best possible effect of suitable lawn fertilizer, an application in early spring around the middle/end of March is ideal. The prerequisite is weather conditions that no longer produce prolonged ground frost.

Those who fertilize later than early April risk starting the season with a nutrient deficiency. This can be corrected later with appropriate fertilization, but full recovery may be weeks or months away.

Tip: The ingredients are more quickly available to the lawn if fertilization is done in the evening shortly after a rain shower.

Recommended ingredients

Spring fertilization is all about the right ingredients. The following are essential to help the lawn grow healthy quickly after winter and cold weather stress:

Nitrogen (N)stimulates growth of green parts of plants
strengthens grass
healthy growth
provides green coloration
Phosphorus (P)acts in the root zone
stimulates grass growth
intensifies green coloration
regulates energy balance
ensures uniform growth
maintains life-supporting functions
Potassium (K)Regulation and optimization of the water balance
“Protective fertilization”
strengthens lawn from heat and dryness of summer
increased defense and resistance to diseases
as a protection against cold also ideal as an autumn fertilizer
Magnesium (Mg)Energy supplier
supports photosynthesis processes
important component of further metabolic processes
Sulfur (S)optimizes protein metabolism and enzyme formation
supports plant growth
improves absorption of important nutrients
prevents fungal and pest infestations

In addition, lawn fertilizer often contains a variety of trace elements that have different effects when fertilized in the spring. The best known of these secondary substances are:

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Boron (B): to improve shoot and root growth; activates growth hormones.
Iron (Fe): required for chlorophyll build-up; promotes leaf greening through
Calcium (Ca): promotes nutrient uptake by roots and needed for cell walls – caution: increases pH
Copper (Cu): essential for photosynthetic function and chlorophyll formation
Manganese (Mn): improves nitrogen uptake, photosynthesis and enzyme activation; especially to be given in sandy soils
Zinc (Zn): Influences protein metabolism and uniform growth; if phosphorus content is high, zinc uptake is impaired and must therefore be administered in addition; too much zinc prevents iron uptake and must therefore be fertilized only slightly


For the best possible effect of spring fertilization, an ideal composition of all components is required:

  • Nitrogen: 25 to 30 percent share – per square meter, depending on the lawn load, approximately ten to 25 grams.
  • Potassium: about 15 percent
  • Phosphorus: about ten percent
  • Sulfur: about ten percent
  • Magnesium: about five percent
  • Secondary substances: in equal proportions up to 30 percent total content

Tip: There are fertilizers available on the market that are specially formulated for the particular demands of springtime lawns. If you rely on high-quality fertilizers from renowned brand suppliers, they usually already have the appropriate composition.

Frequently asked questions

Can fall fertilizer also be used for spring fertilization?

Which lawn fertilizer is suitable for reseeding and new lawns in spring?

If lawns are reseeded after winter or have been completely reseeded, a starter fertilizer is recommended. This is a phosphorus-rich composition, while in older lawns nitrogen dominates. In newly established lawns, phosphorus leads to improved “integration” of seeds in the soil and deep root growth of seedlings is favored. Nitrogen would not be beneficial to seedlings in this case because a healthy root system should be in place first before the grass shoots up.

Does the lawn fertilizer replace reseeding in the spring?

It depends on how extensive the lawn’s thinning areas are. Basically, lawn fertilization with the right composition of ingredients strengthens the grass and also stimulates growth in width. Smaller thinnings can be closed tightly in this way without the need for extra reseeding.

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  • James Jones

    Meet James Jones, a passionate gardening writer whose words bloom with the wisdom of an experienced horticulturist. With a deep-rooted love for all things green, James has dedicated his life to sharing the art and science of gardening with the world. James's words have found their way into countless publications, and his gardening insights have inspired a new generation of green thumbs. His commitment to sustainability and environmental stewardship shines through in every article he crafts.

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