Only then is the grass considered established. Whether starting a new lawn from seed or sod, the wrong time to apply weed killer is at the start of a new lawn. Broadleaf weed killer is considered safe for application onto established lawn grass. Let ABC Nurture Your New Grass For You Growing a thick, robust lawn takes time, dedication and weeks of close attention. In this article I’ll explain when to fertilize new grass … The dead grass will eventually become thatch that nourishes the soil below as the new seeds germinate and grow. Make sure it’s actually grass that needs mowing, too–weeds may need to be cut well before this, but they don’t count. When the grass is covered with frost, it loses its elasticity and blades will break, not bend. Why You Should Avoid Walking on Frozen Grass When a lawn is frosted, the grass blades are literally frozen. It's not a true stem per se, but it still is considered a stem and often called as much. Depending on the grass type, it could take around 8 weeks to reach this height. STAY OFF THE GRASS! The height of the new grass is a good determining factor when it is ready to mow for the first time or not. But cultivating a new lawn requires a certain level of diligence to give grass seed the best chance to germinate and thrive. Heavy foot traffic destroys the millimeter long rhizomes and sods that propagate the sown grass seed. Also, literally the grass you step on is actually all leaf and next to no stem. Normally, when you walk across a lawn, the individual blades of grass are elastic. They bend underfoot and soon bounce back without damage. Will stepping on new grass kill it? If you can’t prevent people from stepping on the frosted grass, here are a few things you can do to give your grass its best chance of fighting the frost: It might seem counterintuitive, but watering your grass the night before an expected frost will help keep your lawn warm and prevent damaging frost. Various grass varieties have diverse germination periods. You certainly won't kill the grass if you step in the same spot on occasion. These products should not be applied to grass that has been newly seeded or sodded until that grass has been mowed 3 times. Generally, once the grass reaches a height of at least 3 ½ inches, it is ready for mowing. When you are walking on a lawn of grass, you are literally stepping on a carpet of thin leaves. So when you are walking on a lawn of grass you are literally stepping onto a carpet of thin leaves that have been trimmed short by a mower. Weed Killers Kill New Lawns. You certainly won't kill the grass if you step in the same spot on occasion. If you're wondering how to kill a lawn or grass and start over, here's one way to do it. Specifically, the grass should start to turn green and require mowing at least twice before it’s time to fertilize for the spring. The other factor is the herbicide's effect on new, tender grass seedlings. 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