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how to prevent weeds when seeding lawn

Growing the perfect lawn takes time and patience and is not a small financial investment. It can be extremely frustrating when just after you’ve finished reseeding your lawn, weeds in new grass begin to peek through. Using weed killer is not the best idea when you are also dealing with fledgling grass, however. You are better off dealing with weeds individually so as to protect the grass around them.

By properly maintaining your lawn, you can avoid the growth of weeds and enjoy lush, beautiful grass. Keep your lawn watered and fertilized if appropriate. Knutsen suggests fertilizing a new lawn between four and six weeks after you plant it. They also suggest that if weeds do crop up before the four to six weeks are up, you can remove them around the eight- to 10-week mark.

Treating Weeds in New Grass

When it comes to the growth of weeds, Daily Gardener explains that the best defense is a good offense. If you haven’t yet laid your grass seed, be sure all existing weeds are pulled up at the root, including those growing near the area you’re seeding. Use weed killer before seeding your lawn if at all possible.

Keep gardens and wooded areas clear of weeds whenever you can to prevent the spread of weeds into your newly reseeded lawn. If you notice that weeds are beginning to encroach on your grass, pull the weeds as quickly as possible.

Depending on the types of fertilizer you’ve used and the potency of the weeds in your lawn, you may find weeds in a newly seeded lawn fairly quickly. One way to prevent this is to carefully remove all existing grass, weeds and topsoil before applying new topsoil and grass seed. Unfortunately, weed pieces and seeds can easily be left behind in the dirt if you do not thoroughly clear your lawn before applying new seed.

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However, you can get rid of these weeds just as fast as they have appeared.
The important thing to remember when new weeds appear in your newly sown lawn is not to act hastily – do not apply a Feed, Weed and Moss Killer type product of any kind on a newly sown lawn.

In short, here’s what you should do if you encounter weeds in your newly seeded lawn:

Although this can be frustrating and we can appreciate that a quick solution will be desired, the good news about these types of weeds is that they are largely shallow rooting and should come out with the first mow at the 6-8 week mark after sowing. If they don’t, they should be easy to pull out of the turf.

If you find that the weeds are recurring past the 6-8-week mark, you may wish to consider using a selective herbicide to spot spray your weeds. Some weed killers such as glyphosate (Roundup) kill more than just weeds, so it is important to not apply these as if they are not done precisely, they can kill your grass. Shop bought selective weed killers will recommend when to apply their product and how often and you should read the instructions thoroughly and adhere to them.

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If you find that when the lawn is at least six months old and has been taken over by weeds or moss, you can use a Feed, Weed and Moss Killer product.