What fertilizer should I use after seeding?

After seeding your lawn, I recommend fertilizing with a high-quality turf fertilizer that is predominantly nitrogen after 4 to 6 weeks of germination. This fertilizer will help the new grass grow healthy and strong. Here are the key points to remember:

  • Fertilize with a high-quality turf fertilizer that is predominantly nitrogen
  • Wait 4 to 6 weeks after germination
  • This will help the new grass grow healthy and strong


Having a beautiful and well-maintained lawn is something that many homeowners strive for. One of the key components of a successful lawn is choosing the right fertilizer to use after you have seeded your lawn. There are lots of options for fertilizer, some with different nutrients and one better for certain turf types than others.

In this article, I’m going to provide some insight on what type of fertilizer should be used after seeding, and I’ll also include a comparison table for easy reference.

What is Fertilizer?

As a gardener and experienced DIY enthusiast, I find it important to understand the basics of lawn care. Fertilizer is one of the most important elements when it comes to ensuring your grass is healthy and vibrant.

Fertilizer is a substance that contains essential nutrients such as nitrogen, phosphorus, and potassium which are used to promote plant growth. It can be any combination of substances, including natural or synthetic materials that are applied to soil or foliage. The type and amount of fertilizer you use will depend on various factors such as the type of grass, its stage in its lifecycle, soil type, and more. Traditional fertilizer formulations contain some mixture of nitrogen, phosphorus, potassium (NPK) but modern products may also include other essential nutrients such as magnesium or calcium depending on what turf needs additional nutrition.

When using fertilizer after seeding your lawn, always follow instructions carefully regarding amount and application time as this will ensure consistent results every time. It’s also important to remember that different types of grass may have different nutritional needs so check with your local nursery for specific recommendations for your area.

When in doubt about what kind of fertilizer to use after seeding your lawn, you can’t go wrong by turning to high-quality turf fertilizers that provide concentrated sources of nitrogen such as ammoniacal nitrate or urea formaldehyde fertilizers. Fertilizing regularly with this type of fertilizer will help promote healthy growth while keeping weeds under control so be sure you know how often and how much you need to apply before getting started.

Benefits of Fertilizer

Fertilizing your lawn after it has been seeded is a crucial part of growing a healthy, lush green yard. Many people overlook this important step or don’t understand the different types of fertilizers and the benefits they can provide. Fertilizer helps stimulate plant growth and aids in seed germination, increases turf longevity, provides essential nutrients to the soil to aid in healthy root development, and helps conserve water. The right fertilizer can also help prevent weeds from establishing themselves in your lawn by providing stronger competition for nutrients in the soil.

When selecting a fertilizer for your seeded areas, you should look for one with advertised amounts of nitrogen, phosphorus and potassium (N-P-K). Nitrogen is the primary nutrient needed for leaf growth; phosphorus stimulates root development; and potassium improves overall turf quality as well as drought tolerance. A high-quality fertilizer with lower amount of nitrogen should be used after seeding to help promote healthy root formation without forcing an explosive top growth which can occur when using too much nitrogen shortly after seeding at once which can damage tender roots.

Types of Fertilizer

As a gardener, selecting the right fertilizer for your new lawn is essential for achieving a lush, green carpet of grass. There are a variety of fertilizers available for purchase, from chemical-based products to organic fertilizers. Each type of fertilizer has its own benefits and drawbacks, so it is important to identify the pros and cons of different types in order to make an informed decision about which fertilizer is best for your lawn.

In this article, I will explore the different types of fertilizer, the benefits of each, and which one is ideal for seeding a new lawn:

Factor Compost Manure Synthetic Fertilizers
Composition Organic matter Organic matter Chemical compounds
Release rate Slow Moderate Fast
Nutrient content Balanced, slow-release Balanced, slow-release High, quick-release
Soil improvement Improves soil structure Improves soil structure Can alter soil chemistry
Environmental impact Low Low High


Compost is often seen as the holy grail of lawn care and plant nutrition. It’s an organic material that has been both biologically and chemically broken down by bacteria, fungi, and other living organisms. Compost is a great source of nutrients that aid in new root growth and grass blade development.

When used after seeding, compost offers several benefits, such as:

  • reducing soil compaction
  • improving water retention
  • preventing soil erosion

However, once the lawn has become established it’s important to remember to fertilize with a high quality turf fertilizer predominantly containing nitrogen after 4 to 6 weeks of germination for best plant health and overall turf quality. Be sure to check your local regulations about compost application since some communities require a soil test before it can be applied.


Manure is an organic material that can be a great fertilizer for the lawn when used correctly. Its main ingredients are nitrogen, phosphorus and potassium, providing vital nutrients to help a newly-seeded lawn grow strong and healthy. It should not be applied immediately after planting the seed because of the risk of over-fertilizing as it will take time for the seed to absorb the nutrients.

If you have access to well-composted manure, which can help reduce the risk of it burning your delicate new seedlings, you can apply this 4-6 weeks after planting. If you can’t source properly composted manure then use natural fertilizers such as bone meal or fish emulsion instead.

Once your young lawn has started to grow and become established then adding a balanced organic fertilizer such as manure or compost to it is an excellent way of continuing its healthy growth. Natural fertilizers tend to release their nutrients slowly and are not prone to burning immature grass as some synthetic products may be. Plus, adding organic material back into your garden helps break down other materials like dead leaves or weeds into smaller particles that act as soil conditioners that improve water carryall and aeration – two essential traits for any beautiful lawn!

Synthetic Fertilizers

One of the most widely used types of fertilizer is synthetic. Synthetic fertilizer produces fast-acting results, so it is typically used to address immediate lawn care needs. These fertilizers often contain chemicals or minerals like urea, ammonium nitrate, and potassium chloride which can be beneficial for your lawn, however, synthetic fertilizers are more likely to leach out over time, meaning the effects don’t last as long as other formulations. To get the most out of a synthetic fertilizer, consider applications just before rain or irrigation.

Formulations vary with different micronutrients based on the needs of the grass type. Depending on your region of the country and grass type you might want a fertilizer high in nitrogen like an 8-24-8 (Nitrogen-Phosphorus-Potassium) from your local garden center. If you are in northern states or planting cool season grasses use a slow release lower nitrogen granular soil amendment at the time of seeding then 4 weeks later fertilize again with something like 8-24-8 which will help promote thick denser growth this fall. In warmer regions use a higher nitrogen formula such as 16-4-8 and apply it as soon as you can after seeding then again 4 to 6 weeks later following germination to aid with thicker denser growth without scorching new grass seedlings due to high nitrogen content brands formulated specifically for new lawns have great success rates and provide extended weed control benefits bringing temporary relief while establishing a new turf stand that won’t thin our anytime soon!

Fertilizing After Seeding

Seeding a lawn is a great way to give your outdoor space a major facelift. After a few weeks of germination, fertilizing can boost the growth of your lawn and make it look lush and vibrant. But which fertilizer should you choose?

In this article, I’ll be covering the best fertilizers for after seeding and giving some tips for using them correctly.


Proper timing is essential when it comes to fertilizing after seeding a lawn. Fertilizers are designed to provide essential nutrients for grass and turfgrass growth, but nitrogen is the most important of these. Because nitrogen can be used quickly by grass and turfgrass membranes, the fertilizer should not be spread until after the newly seeded grasses are established and actively growing.

A common practice with new lawns is to wait two to three weeks after the seeds have been sown before applying fertilizer. During this time, the newly emerging seedlings should be checked regularly to ensure they are healthy and adequately supplied with water. If any seedlings appear diseased or otherwise compromised, it is important to address these problems before applying a fertilizer containing nitrogen that could further exacerbate existing issues.

After this two to three-week period has passed, a slow-release fertilizer should be applied according to package instructions and light watering should follow application immediately thereafter. The water will help settle the fertilizing particles deep into the soil where their effectiveness can be maximized.

To avoid over-fertilizing, it is best practice to:

  • Apply only half of the recommended amount initially then assess how your plants respond in about 7-10 days before reapplying if necessary,
  • Not exceeding initial recommendations for subsequent applications either in amount or frequency.

Type of Fertilizer

When it comes to deciding which type of fertilizer to use after seeding your lawn, it’s important to know what is best for your specific soil and grass type. In general, here are a few types of grass fertilizers you may find on the market:

  • Nitrogen-based fertilizer: This type of fertilizer is typically formulated with high levels of nitrogen and low levels of phosphorus and potassium. This formula is ideal for establishing and maintaining a thick green lawn.
  • Phosphorus-based fertilizer: Also referred to as ‘starter‘ fertilizers, these are designed to encourage the growth of new shoots during the early stages of germination. The amount of nitrogen in this type of fertilizer is usually higher than phosphate levels while the ratio of potassium stays relatively stable.
  • Potassium-based Fertilizer: This type helps develop deeper root systems by providing potassium as well as other trace minerals that can help promote healthy turf growth.
  • Organic Fertilizer: Generally made up from natural ingredients such as composted manure or animal waste products, organic fertilizers provide complete nutrition for lawns without the risk or expense associated with synthetic materials.

It’s important to read the label carefully when selecting a fertilizer so you know exactly what you’re buying and how much you need for each application period. Additionally, if you’re uncertain about what kind might work best for your specific lawn, consult with an expert at your local garden center who can help guide you in selecting the right type product for your needs!


After exploring all the facts and looking at the comparison table, it’s clear that fertilizing the lawn with a high-quality turf fertilizer that is predominantly nitrogen should be done after 4 to 6 weeks of germination. By fertilizing the lawn during this period, you can ensure that your seeding has the best chance of reaching its potential.

Furthermore, it’s important to follow the instructions on the fertilizer package to ensure that the amount of product used is appropriate for the number of seeds in the lawn. By doing this, you can maximize the potential of your seeding.








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