It may take two months or more before your seeded grass reaches the appropriate heights for the first mowing. Here are a few rules to follow: No shoots are showing yet but I am conscious of the rest of the lawn looking ready for a cut! 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. Healthy, deep, water seeking roots means strong plants for optimal growth- and root depth is directly related to grass height. According to The Garden Counselor, moisture, warmth, oxygen, and light are important details to consider as well when thinking about seed germination success. Sprouts that cover the ground and grow to a 3 or 4 inch height are ready for mowing. Seeds and seedlings need to be kept moist (not drowned) at all times to keep from drying out. Water isn’t the only thing to consider when growing your lawn from seed. After all, you want your grass to fully grow in, but you don’t want your lawn to look like a jungle. Is it to early to cut. Getting any of these wrong can ruin your lawn, or you can find you sow your lawn, and the seeds don’t grow because of weed killer traces. This should take about 8 weeks, so be patient! With an electronics degree and more than 10 years of experience, she applies her love of gadgets to the gardening world as she continues her education through college classes and gardening activities. The grass should be at least three inches tall before the first mow. Hi Simon- I would try to avoid those areas all together if you feel that you absolutely need to cut the rest of your lawn, especially if they are of substantial size, until the new growth has enough of a root system to handle a trim. Your new grass seedlings need light to grow; weeds can shade them out. When planting a new lawn, timing is one of the most critical elements of both seeding and aftercare. Grass has been growing well, most is already 4″ and some 6+”. If you mow too early, the grass may die and new growths will be disrupted. A general rule to remember is: if it dries out, it dies out. 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. So don’t feel you are a failure if your space is still a barren brown after a few weeks, especially if you’ve properly prepared the soil and fed your nascent lawn with fertilizer. Wet grass can become torn and tangled, leading to being pulled up by the roots- something you obviously don’t want to happen. Sod should be in place for at least two weeks before … Excessively short, or scalped, grass leads to shallow root systems that cause drought stress. Check the growth of your new grass seed. This was my question exactly. Whether you are over-seeding to thicken up an existing lawn or you . 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. When you are able to cut for the first time, you will want to make sure you follow good cutting techniques and mow high. How to Overseed a Lawn During a Cool Season, University of California, Davis: Mowing New Lawns. In contrast, sod takes the shortest amount of time to establish itself - you can mow … Proper moisture maintenance from the beginning will develop your new growth into the lawn you always wanted. Knowing when to mow and water, as well as the correct cutting procedures, produces strong, healthy growth in newly planted lawns. If someone has guidance or could help with this situation it would be greatly appreciated. The grass should be at least three inches tall before the first mow. Can I mow the lawn,simply being careful when going over the bare patches? You can resume your normal watering schedule of longer, less frequent waterings after these first few days. What is Teff Grass? If you are wondering how long for grass seed to germinate, you first have to look at the type of grass you selected to grow. A week ago I seeded about 20 dog urine patches on my lawn. This will most likely take at least 8 weeks or more after germination! How ya gonna mention the 1/3 rule…. 3 or 4 times during the article, and highlighting it as the last bullet point without ever explaining what it is? If you planted your seeds during their active growing season, the blades should reach a 3 to 3.5 inch height after eight weeks. When mowing, you should only cut about an inch off. Once the sod has rooted into the soil, it can be mowed as needed once it reaches mowing height. This is post construction work. It may take two months or more before your seeded grass reaches the appropriate heights for the first mowing. Once your seedlings have the proper roots to survive, watering properly will help to ensure a long, healthy lawn life. Leave your newly seeded lawn for at least two weeks, and longer if possible, before you attempt to mow it. Backyard Boss is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed Ultimate Play Time: 36 Outside-of-the-Box Backyard Play Sets, Winter Lawn Care Tips To Keep Your Lawn Healthy And Green, Liquid Lawn Fertilizer Reviews: Keeping Your Grass Fabulously Green, Above Ground Pools: Cool Off With 45 Fabulous Landscapes, How to Build an Epic Snow Fort: 5 Pro-Tips for Optimum Construction, 15 of the Best Outdoor Snow Games for Kids, The Best Pet-Friendly Ice Melt to Keep Your Dogs & Cats Safe, Best Walk Behind Salt Spreader – 2020 Reviews, The Best Leaf Raking Hacks Every Homeowner Should Know. You may have some germinating seeds at this point and won’t want to damage the area by running the wheel of a lawnmower over it. Day 7 through 10: Mow. Use a liquid solution diluted to the proper specifications with a lawn hose spay system or a lawn spreader to equally distribute your dry fertilizer granules over your lawn. Their roots are still growing and will not have anchored the grass stems to the soil as strongly as matured plants. The reasons people peruse these articles and forums is to either extrapolate information pertaining to their project, reassuring themselves of the decisions they’re making, or to get a new idea or perspective. You can’t spray herbicide yet, but you can mow to keep weeds from crowding and shading out your seedlings. Not to mention, mower wheels can crush young grass and kill it. You can resume your normal watering schedule of longer, less frequent waterings after these first few days. And more importantly, how long to wait after planting can you mow? 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