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When to mow new grass?

When new grass is bursting up from the ground, you may wonder when you can fire up the mower and begin cutting since there’s nothing quite like the smell of freshly cut grass. Join us as we look into when to mow new grass to achieve the best growth.

Lawn mower mowing a new grass lawn

When to cut new grass seed UK?

Your new grass seed will grow better in the long run if allowed to establish and grow to a specific height before you cut it. Then, by waiting until it’s ready, you won’t damage or hinder its growth! Waiting for around 6-8 weeks (when it’s 5-7cm tall) gives your lawn more time to develop fully so that the mower blades won’t damage it and will continue growing healthy and strong.

What height should new grass be before I mow?

As mentioned, we recommend letting your grass grow to around 5-7cm before cutting it (about the height of your ankle) – and this applies to all our grass seed products. However, it isn’t ready for cutting if it hasn’t reached this height after six to eight weeks. This slow growth could be due to a lack of soil nutrients, an unexpected weather change, or you may have sown your seed too deep into the soil.

The aim is to give your new lawn a trim, so once your grass is 5-7cm tall, set your mower to the highest setting, go over it once, and don’t cut too far down the grass blades.

What height should I cut my new lawn?

You must also use the highest setting on your lawn mower for your lawn’s first mow. After this first cut, you can gradually drop to the recommended mower height for your type of lawn. For example, our Fast Grow Family Lawn has a recommended mowing height of 20-40mm, whereas the ideal mowing height for an ornamental lawn is 10-20mm.

Customers often ask us “when to mow new grass”, and the answer is simple. It is best to give your seedlings at least six weeks to grow and when your grass has reached 5-7cm tall before approaching them with your mower.

Our video guide below will help your garden get the most from each mowing session:

Quick tips for mowing new gras

  • Wait at least six weeks before mowing a new lawn
  • Rake up grass cuttings; you could even add them to a compost heap
  • Let the grass settle for a week or two after your first cut
  • For your second cut, mow to the recommended height for the grass type

Tidy up loose cuttings for better growth

Once you have gone over your garden with the mower, tidy up the loose cuttings afterwards! If you leave them as they are, you will restrict your new lawn from receiving sunlight and undo all your hard work.

Thankfully, you only require a rake and a few minutes of spare time to clean up the loose cuttings from the lawn you have just cut.

Does grass grow better the more you cut it?

Yes and no. It will grow better if you mow your lawn frequently in the spring, summer and autumn months to the correct heights! After your new lawn’s initial cut, you will want to try to keep your grass roughly at the same height when mowing. As mentioned before, we recommend a mowing height of 20-40mm for most of our grasses, with the only exception being our Super Fine Luxury Lawn, which has a recommended height of 10-20mm. However, if you always cut it very short, especially in hot weather, drought, or heatwave, it will struggle to grow consistently!

When to cut grass after seeding

To recap, you should wait at least six weeks before your first mow, then rake up all the grass cuttings, let your grass settle for up to a fortnight before your second cut, and then mow to the recommended height for your grass type.

As you will have read, mowing your newly seeded lawn is easy, but you need to be sure you don’t trim it too early or too much. If you follow our advice on mowing your lawn, your lawn will flourish.

We have further reading on general lawn care to help with the growing of your new grass:

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Product Mentioned...
Fast Grow Family Lawn
  • Family Friendly Grass Seed
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Super Fine Luxury Lawn
  • Luxury Fine Grass Seed
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