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Can you plant grass seed after fertilizing

Author

James Bradley

Updated on March 23, 2026

You can plant grass seed immediately after applying fertilizer. Please make sure there is no weed preventer in the fertilizer, as this will also prevent the grass seed from germinating.

Should I plant grass seed or fertilize first?

Most landscaping professionals agree that it is always best to fertilize the soil first if you are seeding a new lawn. It is also recommended to conduct a soil test so that you select the appropriate fertilizer.

How long after seeding Should I fertilize?

Since each lawn is different, you need to visually determine whether your lawn needs additional fertilizer, but most people can expect to fertilize again within three to four weeks of planting – or when the grass is 1 to 1 1/2 inches tall. This encourages deep roots and inhibits weed growth.

Does fertilizer harm grass seed?

Weed treatments and fertilizers used too close to planting can injure seed. Always read and follow herbicide and fertilizer labels, especially the instructions for use on newly seeded lawns and your grass type.

Should you fertilize or seed first in the spring?

You are probably wondering whether you should fertilize or overseed first in the spring. Either way you choose to proceed is fine; however, you will want to apply starter fertilizer immediately before or after seeding, according to PennState Extension.

When should I overseed and fertilize my lawn?

Spring and fall are good times to aerate, fertilize and over seed your lawn so air, water, and nutrients can really penetrate deeply, softening the soil, and promoting root growth. Use a core aerator when the soil is moist and soft, not dry, and not muddy.

Should you fertilize after overseeding?

If you’ve recently overseeded your lawn, there’s no reason to wait to apply fertilizer. The sooner you spread a lawn starter fertilizer on your yard, the sooner it will begin to feed your grass seedlings. If you like, you apply fertilizer the minute you’re done spreading your grass seed.

What should I put down before grass seed?

  1. A healthy lawn needs good soil. Most turfgrasses prefer neutral soils. …
  2. Don’t apply a weed preventer (liquid or granular) or use weed and feed fertilizer when growing grass. You can control weeds only after you’ve mown new grass seedlings at least four times.

What does fertilizer do for grass?

The use of fertilizer will strengthen your grass roots so they can quickly absorb more water than unhealthy roots. This firms your soil and lessens the chances of water pooling to form messy mud puddles and bare patches.

What month is best to put grass seed down?

Plant cool-season grass seed in late summer or early fall (when daytime temperatures lower to about 60 to 75 degrees) for best success. September is typically the best month, although you might be able to get away with seeding as early as mid-August or as late as mid-October; it all depends on the forecast.

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Is it OK to overseed in the spring?

There are two ideal times of the year to overseed your lawn – fall and spring. Fall is the best choice. … Also, weed growth tapers off after summer, so your new grass won’t have to compete for sunshine, water, and nutrients. Overseeding in spring is the next-best option.

Can I put grass seed on top of grass?

The seed can be mixed with Lawn Topdressing and applied to the lawn jointly. This will save a bit of time and effort working the topdressing and seed into the surface. The seeded area must be kept moist, therefore, water your lawn after 2 or 3 days if no rain has fallen.

What is the best way to overseed an existing lawn?

  1. Establish Your Goal.
  2. Time The Task.
  3. Prepare The Area.
  4. Correct Existing Problems.
  5. Select A Quality Grass Seed Product.
  6. Spread Your Seed.
  7. Fertilize Overseeded Areas.
  8. Keep Your Lawn Well-Watered.

How do you reseed an existing lawn?

  1. Kill existing grass and weeds. …
  2. Select the right grass seed. …
  3. Prep the soil for reseeding. …
  4. Spread the grass seed. …
  5. Fertilize right away. …
  6. Water daily. …
  7. Give your new lawn continued TLC.

How do you plant grass seed in the spring?

  1. Put half the grass seeds in a drop or broadcast spreader. …
  2. Turn the rake so the tines are facing up. …
  3. Cover the ground with a thin layer of mulch made from wheat straw, if your lawn is uneven and prone to erosion. …
  4. Water the lawn lightly each day until the grass is 2 inches tall.

What if it rains after I fertilize my lawn?

Heavy rain right after fertilizing, however, may make the fertilizer run off the soil or into the lower layers, where it won’t do as much good for your roots. Using fertilizer on wet grass the day after heavy rain is also not ideal, because the fertilizers can stick to wet grass and damage it.

Does fertilizer grow grass faster?

Your Plants Will Grow Faster You already know that fertilizer is an important part of your lawn’s diet. But did you know that it’ll actually help your grass grow faster? You can’t rely solely on your soil for great, healthy plant life. You’ll get better results by using fertilizer.

How quickly does granular fertilizer work?

This means that your grass or plants get an immediate serving of potassium, phosphorus, and nitrogen. You can expect to see results as soon as just two to five days after application!

What happens if I plant grass seed too early?

Grass seed needs the correct soil and air temperature, as well as moisture content, to sprout. Planting it too early in the spring can result in less-than-ideal germination, because the seeds can die off or become unproductive.

What happens if you plant grass seed too late?

Grass that is seeded late can die as a result of the cold harsh conditions, or due to drying out. Freezing and thawing of the soil, coupled with a lack of moisture, leaves the tender roots and crowns susceptible to desiccation. Seeding late into the season still requires the same steps.

Should I soak grass seed before planting?

Place the grass seed in a porous material. … Soak the seed in water for 3 to 5 days. Bluegrass should be soaked for 5 days. Make sure all seed is wetted.

Should you wet soil before planting grass seed?

The final step of site preparation for planting grass seed is to water the area well. Putting seed down on damp soil encourages speedy germination and provides immediate moisture to emerging roots. Wetting the area before planting is an important step in the process.

What temperature is too cold for grass seed?

If you’re wondering how cold is too cold for grass seed germination use our rule of thumb and check the weather reports. If the daytime temperature is below 60°F then soil temperature is below 50°F, making it too cold; if there is frost or still a danger of frost, then it’s too cold.

Can I mow after overseeding my lawn?

6. You mow too soon. After you lay down your seedlings, they’ll need time and the right environmental protection to grow. They’ll need to acclimate and set roots before the first mow, so during the first two to four weeks post aerating and overseeding, don’t mow.

Do birds eat grass seed?

Sparrows, finches, buntings, pigeons, even parakeets — these are just a few of the seed-eating birds you’ll have to watch out for. The best time to sow grass seeds is in late summer through to mid-autumn. At this time of the year, birds should have plenty of wild seeds and berries to feast on.

How do I fix bare spots in my lawn?

  1. Rake the Area. Rake and remove any debris or dead grass from the area, using a garden rake. …
  2. Loosen the Soil. Break up the soil with a hard-toothed lawn rake or a garden cultivator. …
  3. Amend the Soil. …
  4. Spread the Seeds. …
  5. Rake the Seeds. …
  6. Begin Watering. …
  7. Mow When Ready.

Should I use top soil when overseeding?

When overseeding your lawn, it is better to use compost as a topdressing instead of topsoil. This is because compost is rich with nutrients and organic materials which will feed the grass seed and work their way into the existing soil as the compost breaks down.