With the special care we all take I think the existing grass will be fine. If watering, water heavily every few days in the early morning, not lightly every day. I think you can rent a reel mower from the big box stores. The water needs to get down into the soil. Check below: Step:1. WestchesterGrower. For new grass you want to be sure the grass has reached at least 3 ½ inches in height, if not more, before cutting for the first time. After overseeding your lawn, it needs consistent moisture. If you can do it right before a rainy week, great. 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. Damage to new lawns often occurs during the early stage of seed establishment. After you lay down your seedlings, they’ll need time and the right environmental protection to grow. Watering your lawn may seem natural, but proper watering has a little more science behind it. The are not yest secured and will easily be removed. I cut the grass very low before seeding, although I did not scalp it since it really had 75% cover+ and the original lawn was descent. Try and stick somewhat to the 1/3 rule when cutting the really tall existing grass, in other words, if you let it grow another week and it's 11" (but the new grass is like 3.5" and thus safer to walk on), cut it to as high as your mower will go and then cut it again in about a … Too soon to cut after over-seeding? There are various types of grass that you can plant on your lawn depending on what you prefer. Like all seeds, germinating grass seeds tend to be fragile. The roots are no deeper in the soil at this this point than the seedlings are tall. 6. Hence, after lawn seeding, you had better wait for your grass to grow for a time and gain strength before the time to mow it comes. Wait until the young grass is at least 2 inches long before mowing again. Knowing when to mow and water, as well as the correct cutting procedures, produces strong, healthy growth in newly planted lawns. How To Water Lawn After Overseeding. Maintaining a 2 or 3 inch height is critical; do not cut the grass lower than this range because invading weeds and heat stress invite pathogens and pests into the newly seeded lawn. Thus, it’s important to identify the type of grass used for overseeding. Just about every lawn around me gets cut more than 1/3 year after year and they survive. Once the grass has gained a little height, you can ease back to your normal pattern. Once these height ranges are achieved, you can start cutting the grass for the first time. We will give you some expert tips on how to water lawn after overseeding. 10 years ago. Otherwise, give it some more time and then mow the existing grass … Therefore, you should always consider the type of grass that you are overseeding on your lawn in order to know how long you should wait before mowing your … In general, however, you should not do any mowing during the first two weeks to four weeks after planting the new grass seeds. Hi, I overseeded with KBG around 2 weeks ago and most of the seed has started to come up. By following this, you can have a beautiful garden. If you cut the grass too early, the wheels and blades of your lawnmower are just pulling your grass sprouts from the soil instead of mowing them. You also don't want to suck up the germinated ones. If you water for 15 every morning, you are losing a lot to evaporation. You mow too soon. For about three weeks after seeding, or until the grass begins to peek out of the dirt, set a daily watering schedule. 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