The established grass still needs its own share of water and nutrients, so it should be mowed first. Week 4 and beyond: A month after your new seed has had time to establish, it is safe to begin to cut … Make sure that the grass height is significantly low because the new grass seedlings need room to grow. Just about every lawn around me gets cut more than 1/3 year after year and they survive. How long until I can mow after overseeding? Look for bare spots and thin spots, indicating slow germination. 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. Tuesday 9/1 my lawn was aerated and overseeded. It may take two months or more before your seeded grass reaches the appropriate heights for the first mowing. Check the growth of your new grass seed. 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. 6. 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. With the KBG in the mix, I'd wait longer than 2.5 weeks to mow. You mow too soon. The new grass needs sufficient time to mature and to begin establishing a root system and will scalp easily. This time, again, you ought not to remove over one-third of the grass length. Individual grass seeds germinate at different rates, especially in lawns seeded from seed variety mixtures. Avoid using a heavy-duty lawn mower and turning your lawnmower direction too quickly so that the wheels will not … 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. Before overseeding, I gradually cut my grass much shorter than I normally cut it. Once the grass has gained a little height, you can ease back to your normal pattern. Don’t perform the second mowing session until 3 to 5 days after the first one. This can vary widely depending on the species. Before you conduct overseeding to thicken your lawn, you have to mow the current lawn first. That's probably long enough to wait for fescue and/or rye, but KBG can take 3 weeks or more to germinate. Prior to mowing, you should discontinue watering for 1 day before mowing to let the lawn dry out. Only by these 5 tools, you can mow after overseeding perfectly. 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. For example, let tall fescue grow to 4.5 inches before trimming and allow zoysia to grow to 1.5 inches. Homeowners may have to wait up to two months before mowing the lawn after seeding. For about three weeks after seeding, or until the grass begins to peek out of the dirt, set a daily watering schedule. Leave your newly seeded lawn for at least two weeks, and longer if possible, before you attempt to mow it. With the special care we all take I think the existing grass will be fine. Because you must wait for seeds to germinate, you cannot cut the grass until two months have passed. This may mean daily watering for three to four weeks after seeding. Good luck and let us know if you have any other questions!” Spring-Green can help with core aeration and overseeding. 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. 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. 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