Step 3: Be ready Before you start mowing, you must be prepared by dressing yourself and putting on the gloves on your hands so that soil can’t make your skin rough. Tuesday 9/1 my lawn was aerated and overseeded. Check the growth of your new grass seed. That's probably long enough to wait for fescue and/or rye, but KBG can take 3 weeks or more to germinate. You mow too soon. Look for bare spots and thin spots, indicating slow germination. Once the grass has gained a little height, you can ease back to your normal pattern. By the fact that you are overseeding I think we can assume you'll be OK losing/stressing the existing grass for the sake of new seeds. Because you must wait for seeds to germinate, you cannot cut the grass until two months have passed. A lawn kept right around 3 inches following the ⅓ rule is the perfect height to ensure healthy new growth before cutting again, as well as the added benefit of crowding out unwanted weeds. 6. Prior to mowing, you should discontinue watering for 1 day before mowing to let the lawn dry out. The new grass needs sufficient time to mature and to begin establishing a root system and will scalp easily. Before overseeding, I gradually cut my grass much shorter than I normally cut it. Before you conduct overseeding to thicken your lawn, you have to mow the current lawn first. Make sure that the grass height is significantly low because the new grass seedlings need room to grow. Good luck and let us know if you have any other questions!” Spring-Green can help with core aeration and overseeding. Since roots anchor your seedlings into place, if you mow too early you can rip your new growth right out of the ground, negating all the weeks of watering and anxious waiting for the green to appear. Leave your newly seeded lawn for at least two weeks, and longer if possible, before you attempt to mow it. The established grass still needs its own share of water and nutrients, so it should be mowed first. Homeowners may have to wait up to two months before mowing the lawn after seeding. This time, again, you ought not to remove over one-third of the grass length. This will allow the new seed time to develop roots Mow newly seeded areas at approximately 3” high from the first 4-6 weeks after the seeds have germinated – This means mowing a little higher than usual. Week 4 and beyond: A month after your new seed has had time to establish, it is safe to begin to cut … Individual grass seeds germinate at different rates, especially in lawns seeded from seed variety mixtures. For example, let tall fescue grow to 4.5 inches before trimming and allow zoysia to grow to 1.5 inches. With the KBG in the mix, I'd wait longer than 2.5 weeks to mow. How long until I can mow after overseeding? For about three weeks after seeding, or until the grass begins to peek out of the dirt, set a daily watering schedule. Just about every lawn around me gets cut more than 1/3 year after year and they survive. Don’t perform the second mowing session until 3 to 5 days after the first one. I'd wait as long as you can before mowing to give the KBG a chance. This can vary widely depending on the species. It may take two months or more before your seeded grass reaches the appropriate heights for the first mowing. Only by these 5 tools, you can mow after overseeding perfectly. After you lay down your seedlings, they’ll need time and the right environmental protection to grow. I then applied some starter fertilizer and some peat for good measure. The most important aspect of overseeding (whether you do it in the fall or earlier in the season) is providing enough water to prevent the seed from drying out. 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