The soil nutrients most important to healthy grass plants are nitrogen, potassium and phosphorous. Supply these nutrients by applying a commercial fertilizer formulated for starting lawns and lightly rake it into the soil before you reseed. Buy a grass-seed blend suited to your climate and local conditions and spread it over the lawn with a drop spreader or rotary spreader. Absent a different recommendation from the grass-seed grower, spread the seed at a rate of 2 pounds per 1,000 square feet on a lawn with substantial plots of live grass and 3 pounds per 1,000 square feet on bare soil. Water lightly once or twice a day to keep soil moist but not sopping wet. Don’t mow until the new grass gets 3.5 inches tall.
Most deteriorated lawns have a built-up layer of dead and partially rotted grass stems, roots and rhizomes just below the green grass leaves. This is known as thatch, and it must be removed before reseeding so water and fertilizer can reach the new seed. For small lawns, you can remove thatch with a garden rake. For large areas, go over the lawn with a power dethatcher, also known as a vertical mower or power rake. These machines can be rented from garden centers. Remove the clumps of matter left by the machine with a garden rake and level the soil by raking it.
If you are faced with a neglected lawn that’s partially dead and is being taken over by weeds, you may be able to renovate it. Restoring a deteriorated lawn may be possible if the weeds and dead spots cover less than 40 percent of the lawn area. Renovation of a weedy lawn involves more than just mowing down the weeds and throwing some grass seed over the lawn.
The best time for lawn renovation throughout the U.S. is mid-August to mid-September. Most weeds have not yet dropped their seeds and there will be little new weed growth. Also, reseeding at this time will give the new grass a chance to establish itself before going dormant for winter. Get rid of the weeds by manually pulling up large, spreading weeds. Follow up by applying a selective herbicide product that kills common broadleaf lawn weeds while not harming grass. For tough grassy weeds, like quack grass or crabgrass, use a nonselective herbicide such as glyphosate on the spots where these weeds have established themselves. Normally, all weeds will be dead within two weeks. Apply another herbicide dose in three weeks to get newly sprouted weeds.
If you have had a dry summer with below-normal rainfall, you need to replenish soil moisture before preparing a seedbed. Give the entire lawn a thorough watering, soaking until water has penetrated to a depth of at least 6 inches, then allow the surface to dry for a day or two before starting soil preparation.
Herb Kirchhoff has more than three decades of hands-on experience as an avid garden hobbyist and home handyman. Since retiring from the news business in 2008, Kirchhoff takes care of a 12-acre rural Michigan lakefront property and applies his experience to his vegetable and flower gardens and home repair and renovation projects.
In order to make a successful game plan, you’ll need to know just what kind of weeds you’re dealing with. Weed treatments are designed to target specific weeds, so what may work on your broadleaf weeds may leave your grass-like weeds A-OK.
Once the weeds—and grass, if applicable—turn brown, it’s time to bust out your rake. Rake up as much of the weeds as you can. Use your tilling fork to pull any extra weeds out and till the soil to prepare it for your amendments and seed.
Restoring a Lawn Full of Weeds in 10 Steps
Top the seed with top dressing no greater than ¼ inch thick.
Keep in mind that herbicides can kill whatever plant life they come into contact with—even if the label says otherwise—so handle with care. If your aim is to re-establish your lawn, as we recommend, killing your existing, thinning grass isn’t a big deal, since you will need to start fresh anyway.
Once you’ve put in all that hard work, you’ll want to keep up with it. The prospect of regular lawn maintenance can be daunting, from fertilization to aeration to yet more weed control. Hiring a professional lawn care company like TruGreen can alleviate those concerns.
Luckily, you can bring your lawn back to life by ridding it of weeds and boosting your turf’s health. Here’s how to get rid of weeds in your grass for good.
So, the best way to get rid of weeds is to make your lawn an environment where it’s difficult for them to thrive.
My lawn is all weeds. What should I do?
Yes! But it may take more time and effort. Spraying vinegar directly on weeds is a natural way to get rid of them. It dries out the plant leaves and kills what’s above the ground.
Taming a lawn full of weeds might feel daunting, but it’s all about keeping your turf as healthy as can be.
If you spray that, you can kill 80 to 100 percent of weeds’ top growth, found USDA research.