Reviving a scarified lawn means dealing with thatch, weeds, and moss, and then aerating it. You also have to add top dressing, overseed and fertilise it to promote its recovery. Following these steps in the right order will create optimal conditions for your lawn to bounce back. The result can be the best lawn you’ve ever had.
Quick answer: Yes, it is normal to have little or no grass left after scarifying, especially after using a powered scarifier on a mossy or thatchy lawn. The grass roots are usually still alive. Overseed within a day or two, keep the seed moist, and most lawns show new green growth in 2 to 3 weeks and fully recover in 4 to 8 weeks.
Helping your lawn to recover after scarifying isn’t hard. It all starts with understanding how scarification works.
Scarifying may look harsh, but it’s super effective for removing moss. Image credit: @jameslawnscience
What happens during lawn scarification?
Lawn scarification is the process of raking the lawn and breaking up the soil to remove debris, thatch, weeds and moss. Scarification also makes the soil less compact, allowing the grass to grow better.
Image credit: @agronomy_australia
Scarification damages the surface of the soil deliberately. This allows moisture to remain near the roots of the grass. It promotes the deeper growth of the roots and supports their development.
You can scarify your lawn using a rake or a manual or petrol-powered scarifier. You could also use a tiller attachment for your lawn mower. For best results, though, use a scarifier as it will also loosen compact soil.
The best time to scarify your lawn in the UK is early autumn (September to early October) or mid-spring (April). The soil is warm and moist at both times, so the grass recovers quickly and new seed germinates fast. Both are also the best times to overseed, which is important after scarifying. Avoid scarifying in summer heat, in drought, or when frost is forecast.
Warning: Scarifying your lawn may make it look a bit scary. But this is normal. Within a few weeks, it will look much better.
Is it normal to have no grass left after scarifying?
Yes. A scarifier is designed to rip out moss, thatch and dead grass, and on a neglected lawn that can be most of what you could see. If moss made up half your lawn, half your lawn will look bare afterwards. Healthy grass plants usually survive with their roots and crowns intact, even if the blades look thin and flattened.
To check, tug gently at a few of the remaining tufts. If they stay anchored, they will regrow. Patches of bare soil with nothing rooted in them need overseeding.
Scarifying causes more damage than it should when:
- The blades are set too deep. Start with a high setting and lower it gradually. The blades only need to reach the thatch layer, not dig into the soil.
- The lawn is wet. Wet soil lets the blades pull up whole grass plants. Scarify when the surface is dry but the soil below is moist.
- The weather is hot or dry. Grass cannot recover in drought, so the bare patches stay bare.
- You make several passes in the same direction. Make one pass, then a second pass at an angle only if there is still a lot of thatch.
Even an over-scarified lawn will recover if you follow the steps below.
New to scarifying? See our guide on how to scarify a lawn by hand with just a rake.
Next, let’s see how to revive a lawn after scarifying.
What to do after scarifying a lawn to revive your grass?
Did you scarify your lawn to restore or repair it only to end up with no grass left? Follow the steps below for the best lawn treatment after scarifying.
If you’ve only scarified your lawn as part of annual maintenance, it’s still good to follow most of the steps below. But if you’re hard-pressed for time, focus on overseeding and fertilising.
Good to know: If you’ve used a scarifier, it will have already done some soil aeration, though not as much as an aerator.
1. Identify potential problems
Scarifying is meant to be a solution to your lawn problems, weeds, moss and thatch included. But it can uncover problems with the lawn that you may not have realised were there. Here are some of the common problems you may encounter:
- Weeds or moss cover a wider area than expected. (See Steps 2 and 3)
- Bare patches of grass. The grass may grow in different directions under the thatch so that when you scarify the lawn, the scarifier may pull out big chunks of grass. This happens especially when you use a powered rake scarifier on a lawn that’s been over fertilised. (See Steps 6 and 7)
- Thatch overgrowth smothers the grass beneath. (See Step 8)
The steps below can help you solve all these problems. But even if you don’t have any of them, following all the next steps will help your scarified lawn recover beautifully.
2. Remove the weeds
Removing any weeds after scarifying your lawn is crucial. If you don’t, they can easily spread in the exposed soil and take over the lawn.
Dig the weeds out of the soil. Be careful to remove all of them. Don’t leave any weed roots or debris in the soil. It may involve some serious work, but it will save you a lot more trouble in a few months’ time.
3. Deal with moss
Moss lawns are all the rage. But if you don’t want the moss to compete with the grass for the nutrients in the soil, it’s time to deal with it.
If done properly, scarifying should remove most of the moss. But you may still notice patches of it. To kill unwanted lawn moss, use a selective moss controller.
Moss controllers usually contain iron sulphate, which can kill the moss within a few days without damaging the grass. They are available as granules, typically as a fertiliser that also promotes lawn health.
Important: Using a store-bought moss killer? Check its fertilising effect if you plan to fertilise your lawn after scarifying otherwise you may risk over fertilising the grass.
You can also kill moss with a homemade moss killer. Mix 1 tablespoon of white vinegar (distilled) into 4 litres of water. Spray the mixture with a garden sprayer only on the moss.
Don’t spray the grass as the vinegar may kill it too. You may have to spray the moss repeatedly for all of it to die. Make sure to rake the dead moss and throw it away. Don’t compost it.
Read more: How to get rid of moss in lawn – best moss killer treatment
4. Mow the lawn
Mowing will help to cut any tufts that stick out, levelling the lawn. It can show you which areas you need to focus on when adding top dressing and overseeding (see Steps 6 and 7).
Use a mower with a catcher bag as it will remove leftover clippings from thatch, weeds or moss. These could be difficult to remove otherwise, hence the value of mowing after lawn scarification.
Important: Don’t mow when the soil is wet, or you may damage the lawn. Also, avoid mowing soon after applying a non-selective moss killer to the lawn. It may spread the moss killer over the lawn and damage the grass.
5. Aerate
Aeration essentially means poking holes into the soil. Aerating a scarified lawn improves water drainage and helps the soil breathe better. It can prevent disease and help the lawn recover faster.
You can aerate your lawn manually with a fork, but that involves some serious work. For best results, use a lawn aerator. Lawn aerators come in many shapes and sizes. Your options include push spike rolling aerators, manual plug core aerators, and even lawn aerator shoes. We compare the options in our guide to the best lawn aerators.
For a small or medium lawn, a rolling spike aerator is the quickest manual option. The Greenkey roller has thirty 45mm spikes and you simply push it across the lawn.
For larger lawns, use an aerator/scarifying machine. It runs on petrol or electricity and can save you a lot of time. But pay attention to the settings you’re using. Aerating too much may end up damaging the roots of the grass.
These boots were made for aerating and that’s just what they’ll do! Image credit: @suburban_homestead
6. Consider adding top dressing
Adding top dressing helps to fill any uneven spaces left after scarification. This includes patches from where you removed weeds or moss.
It can also improve the quality of the soil. What’s more, adding topsoil will help any new grass seeds you plant to take root and grow. It facilitates scarified lawn recovery.
Use a sandy loam lawn dressing rather than ordinary compost. Spread a thin layer, no more than about 1cm, and brush it into the surface so the grass can still poke through.
Tip: Don’t compact the soil you add as in the next step you’ll be seeding your lawn.
7. Plant new grass seeds
If you notice bare patches or low spots in your lawn after scarifying, seed them first before over seeding the rest of the lawn.
Broadcast the rest of the seed over all the lawn. It adds to your workload, but it will help rejuvenate your lawn. Overseeding after scarifying leads to richer, more beautiful grass.
More on this: When to Seed a Lawn: Best Time to Sow Grass Seeds in the UK
Work the seeds gently into the topsoil or cover them with a fine layer of topsoil. You don’t want the birds to peck at them before they have the chance to grow.
Important: Choose the same type of grass as your lawn grass to promote even growth and shading.
Follow the sowing rate on the pack. Overseeding usually needs about half the rate of sowing a new lawn. A hard-wearing, fast-germinating seed suits most family lawns. Pronto Seed germinates in 7 to 14 days in warm soil and has over 25,000 Amazon ratings.
A spreader gives a much more even result than scattering by hand, and you can use it for lawn feed too.
8. Apply lawn feed to fertilise new seeds
For convenience, you can fertilise a scarified lawn straight after you plant new grass seeds. Grass seeds don’t need fertiliser to grow in the first weeks but the fertiliser will help the rest of the lawn to recover.
Use a general-purpose fertiliser for spring/summer or autumn, depending on when you scarify your lawn. The best fertiliser after scarifying will have potassium to help the lawn bounce back.
When to feed a lawn after scarifying: apply a seed-safe feed on the same day you overseed, or wait until the new grass has been mown two or three times. In autumn, use a feed that is high in potassium and low in nitrogen. It hardens the grass for winter instead of pushing soft growth that frost will damage. In spring, use a balanced or higher-nitrogen feed. See our guides on when to feed a lawn and winter lawn feed.
If you’re dealing with thatch overgrowth, you may have been over-fertilising your lawn. Consider skipping the fertiliser to give the soil time to recover its balance.
Important: Avoid using fertilisers with weed killers in them if you overseed. It may kill the grass seeds.
More on this: Spring Lawn Feeding: When To Do It & Best Fertiliser
9. Water the lawn
Last but not least, water your lawn carefully. If you use a hose, add a sprinkler so that the stream of water won’t disturb the new seeds.
Continue to water your scarified lawn so that the soil doesn’t turn a light colour. Watch the weather forecast and make sure the lawn has enough water.
Adequate watering promotes the growth of grass and helps it recover faster. It also helps the soil to settle.
Top tips for scarified lawn recovery
Make it easier for your lawn to recover after scarification by doing the following:
- Mow your lawn before scarifying it. It helps remove dead grass and enables the scarifier to work more easily.
- Avoid over fertilising a scarified lawn. It may damage the grass and lead to brown or yellow patches.
- Avoid walking, running and other activities on the lawn until it recovers. Children and pets running in a picture-perfect twilight don’t count!
- Wait until the grass regrows to about 2.5 inches before mowing. This will give the scarified lawn time to recover.
- Mow with the blades at a high setting. Don’t switch to a lower setting until after the grass has become established.
Scarified lawn before and after
Your lawn may look bare and sad after scarifying, but that’s only normal. Give your scarified lawn time to recover and it will look amazing.
Once it recovers, a scarified lawn will look greener, richer, and healthier, provided you take good care of it. All the new, vigorous growth will add colour and vibrancy to your lawn.
Lawn scarification may look disheartening at first, but as you can see in these images from Lawn & Weed Expert, the results are worth the effort.
A lawn needs around 4 to 6 weeks to recover after scarifying in spring. If you have to over-seed large portions, it may take a bit longer for it to come into full beauty. If you scarify in autumn, it may take until next spring to see the full results.
How long does a lawn take to recover after scarifying?
Most UK lawns recover in 4 to 8 weeks. This is a typical timeline after scarifying and overseeding in spring or early autumn:
- Days 1 to 2: aerate, top dress, overseed and water.
- Days 7 to 21: the new seed germinates. It is faster in warm soil and slower once the soil drops below about 8°C.
- Weeks 3 to 4: a green haze covers the bare patches. Keep watering lightly if it is dry.
- Weeks 4 to 6: make the first cut once the new grass reaches about 7 to 8cm. Use a high setting and only remove the top third.
- Weeks 6 to 8: the lawn is thick enough for normal use.
If you scarify after mid-October, the soil may be too cold for seed to germinate. In that case, rake out the debris, top dress, and overseed the following April.
Frequently asked questions
No grass left after scarifying: is that normal?
Yes. Scarifying removes moss, thatch and dead grass, so a mossy or neglected lawn can look almost bare afterwards. The grass roots are usually still alive. Overseed within a day or two, keep the seed moist, and most lawns show new growth in 2 to 3 weeks and recover fully in 4 to 8 weeks.
When should I feed my lawn after scarifying?
Apply a seed-safe lawn feed on the same day you overseed, or wait until the new grass has been mown two or three times. Avoid weed and feed products on newly seeded lawns, because the weedkiller can stop the seed growing.
What is the best fertiliser after scarifying?
In autumn, use a feed that is high in potassium and low in nitrogen, such as a 6-5-10 autumn lawn feed. It strengthens the grass for winter. In spring, use a balanced or higher-nitrogen feed to push new growth.
How long after scarifying should I overseed?
Overseed straight away, ideally on the same day or within a few days. The scarified surface is open and loose, so the seed makes good contact with the soil and germinates quickly.
When can I cut my grass after scarifying?
Wait until the new grass is about 7 to 8cm tall, usually 4 to 6 weeks after overseeding. Use a high setting and only cut the top third of the grass.
Can I scarify my lawn in October?
Early October is fine in most of the UK while the soil is still warm. After mid-October, the soil is often too cold for new seed to germinate, so it is better to wait until April.
Treating a lawn after scarifying is not scary
You can bring a scarified lawn back to life without breaking your back or losing sleep. Once you identify potential problems, deal with weeds and moss, mow the lawn and aerate it.
Then get it ready for new growth by adding top dressing, planting new grass seeds and fertilising it. Water it if it doesn’t rain enough, and after about 4-6 weeks, your lawn will look better than it did before scarification.
Now that you know what to do after scarifying a lawn, it’s time to roll up your sleeves and get to work. Don’t skip any steps and don’t let a bare, thatchy, scarified lawn make you cringe. Scarifying your lawn is necessary to keep it healthy and looking its best.
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Thanks not only for the ” follow this …..” but for your so positive encouragement.
Thank you. !!!!