Can you seed after moss control?
Daniel Moore
Published Jan 17, 2026
After you have killed and removed moss from your lawn the final process is over-seeding – introducing new, healthy grass plants to in-fill the gaps left by the moss that's been removed, creating a stronger, healthier lawn that's more capable of dealing with the challenges nature throws at it.
How long after using moss killer can I seed?
Moss killers should not be applied to newly seeded or sodded lawns until after at least 4 mowing's. Do not re-seed any bare spots until 4 to 6 weeks after applying a moss killer.
Can I put grass seed down after moss killer?
Add lawn grass seed. If damage is patchy then a light sprinkling (10 to 20 seeds per square inch – no more) into those areas may be all that is needed. However, if you've done a thorough de-mossing or de-thatching then it's risky to expect a full and uniform recovery so get some grass seed into the whole lawn.
How do you grow grass after moss removal?
Apply a Fertiliser
If your lawn has been covered over by a thick layer of moss then chances are, the soil doesn't have the nutrients it needs to recover quickly. By applying a fertiliser you'll put these much-needed nutrients back into the soil. This will help the new grass seed to germinate and grow quickly.
How long after moss killer can I fertilize?
If you are treating moss, rake the dead moss from the lawn after elimination. We would recommend waiting at least one week before applying a fertilizer to your soil. Be sure to use a fertilizer that has low or no phosphorus in it so that there are no adverse effects with the product.
39 related questions foundWill grass regrow after raking out moss?
It's likely that your soil's pH is too low, it becomes acidic and moss will flourish. In this case, no matter how often you remove moss, it will keep coming back unless you can raise the pH. Johnsons Lawn Seed's After Moss is coated in calcium carbonate which raises the pH of the soil for you.
Will grass grow back after moss?
Moss will come back unless the growth environment in the yard is changed to be less hospitable to moss. Reseeding a lawn after moss removal is only part of the solution. Moss thrives much like weeds do, and will take over when a lawn isn't maintained properly.
Do I need to remove moss before seeding?
Late spring or early fall are the best times to kill lawn moss. 2 Killing moss should always be done before seeding your lawn, which is best done in the early fall.
When should I reseed my lawn?
Early fall is the very best time to reseed. Soil temperatures are still warm, which is necessary for optimum seed germination, and cooler air temperatures are better for grass growth. There will also be fewer weeds for the grass to compete with at this time of the year.
How do I revive my lawn after scarifying?
If you have scarified your lawn in the spring, then a spring time fertiliser is probably best to help encourage rapid grass growth. When doing this, ensure that the lawn has plenty of water. Also continue to water your lawn regularly for the next few weeks if it has not been raining.
When should I scarify my lawn after moss killer?
If it contains a large amount of moss or is looking particularly yellow, you may be tempted to scarify your lawn. So when is the best time? Answer: Late spring (mid-April onwards) and autumn (September) are good times to scarify your lawn, particularly if it is not too dry.
Should I mix grass seed with topsoil when overseeding?
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.
Can you put too much grass seed down?
All plants, including grass plants, need adequate soil space for roots to spread and develop. If you put down too much grass seed, you will encourage competition that will cause your grass seedlings to struggle after germination because there will be excessive competition for sunlight, soil nutrients, and water.
Can I put grass seed on top of grass?
Overseeding is spreading grass seed over an existing lawn. Done right, it's a straightforward process that gets results. As grasses mature, thinning is normal—especially if you enjoy your lawn and use it often. Overseeding keeps your lawn competitive and steeped in youth and vigor, without starting over from scratch.
Can I plant grass seed on moss?
Similarly, you cannot just plant grass over moss and expect it to take. Instead, you need to treat the conditions that are causing the moss to grow in the first place. One of these can be an overly shady area. To fix this problem, you can consider cutting down trees or shrubs that cast large shadows over your lawn.
How do I reseed my lawn?
Just follow these simple steps for reseeding your lawn.
- Kill existing grass and weeds.
- Select the right grass seed.
- Prep the soil for reseeding.
- Spread the grass seed.
- Fertilize right away.
- Water daily.
- Give your new lawn continued TLC.
What happens if you overseed your lawn?
In the simplest terms, overseeding is adding grass seed to your existing lawn without turning the soil. This adds more color to your lawn, helps create thicker grass, and introduces enhanced varieties of grass to your lawn.
How much does 20lbs of grass seed cover?
This 20 lbs. bag covers up to 6,660 sq. ft. for overseeding an existing lawn and 2,220 sq.
Should I aerate before I seed?
The most important step you can take before overseeding your lawn is aerating your soil. No matter what seed you use, they can't germinate in compacted soil devoid of water, nutrients, and sufficient air exchange. That's why it's crucial to aerate your lawn before starting the overseeding process.
What comes first fertilizer or grass seed?
How soon after applying fertilizer can I plant grass seed? 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.
Can you put topsoil over existing grass and reseed?
Spreading Topsoil
In most cases, a lawn can withstand the addition of a soil layer that is only 1/4 to 1/2 inch thick. You can spread topsoil evenly and accurately over the lawn by using a drop-spreader, or you can spread topsoil simply by flinging it with a shovel.
When should I scarify and reseed my lawn?
October - Often considered the best month to scarify your lawn, it is in fact rather late. Temperatures drop and green growth starts slowing down. The wet weather combined with the cold often creates large patches of bare soil, which barely recover as is.
Why is my lawn full of moss?
Generally, the reason for excessive moss growth in lawns is that the grass is struggling, normally this is due to poor environmental conditions that favour moss for example low light, excessive moisture or soil compaction. To keep your lawn healthy and growing it's important to remove moss from your lawn.
Should I overseed after scarifying?
A lawn top dressing should be applied following scarification, aeration and overseeding. Some turf care experts recommend the grass seed being mixed with the top dressing, either way should produce good results.
Do I need to overseed after dethatching?
It is a good idea to seed your lawn after you finish dethatching it. The holes left by the dethatcher make it easy to get the seeds into the soil. People often overseed to fill in bare spots and replace sections where grass came up with the dethatching. If you plan to seed your lawn, do it after you dethatch.