If your lawn is weedy or your grass is in poor shape, establish a healthy new lawn by starting over. Follow all our steps for success.
Let's get this straight right from the get-go: A healthy lawn doesn't get taken over by weeds. So if it looks like you're raising weeds instead of grass, that's a sign of a more serious problem. And that may mean killing off the grass and starting over. It's a big project that'll take several weekends and may cost you up to 25¢ per sq. ft. for equipment rentals, soil conditioners and seed. If you're willing to spend more, you can lay sod instead of planting seed, but don't skip the soil testing and remediation steps.
Are you ready for a fresh start? Just follow our guide and you'll be the happiest gnomeowner on your block.
Going “nuclear” shouldn't be your first option. Instead, start with spot applications of weed killer, dethatching and core aeration. But if you still see more than 60 percent weeds at the start of the next growing season, your lawn is too far gone to save. Your best option is to nuke it and replant.
Note: To find out how to dethatch and aerate for greener, healthier grass, search for “lawn.”
Plunge your spade about 6 in. deep and pull out a plug of soil. Then slice off a section of the plug (top to bottom). Remove the grass and rocks and mix all the samples together.
Don't even think about replanting until you get the results of a soil analysis (cost is usually less than $20). Contact a local extension service or search the Internet for a soil-testing lab near you. Select three different locations around your lawn and collect samples. Mix them together and scoop into a container. Note on the lab form that you'll be planting new grass and whether you bag the clippings when you mow or return them to the lawn. In a couple of weeks, you'll get a report with recommendations about which fertilizers or soil treatments to add.
Lay the poly film over the lawn and secure it with rocks or stakes.
Cover nearby plants with a tarp. Choose a calm day and hold the spray head close to the grass to prevent overspray.
You can kill the grass with chemicals like Roundup or Killzall. But if you hate the idea of using chemicals and have a large area, rent a sod cutter to remove the lawn surface. Or kill the grass by blocking out its sunlight with black poly film (4-mil or thicker; about $100 for a 28-ft. x 100-ft. roll). Remove the poly when the grass is dry and brown (two to three weeks or longer, depending on the weather).
Rip up all the dead grass and weeds with a rigid tine rake and lots of muscle.
Now comes the upper body workout: Rake up the dead grass and weeds before you amend the soil. Yup, it's got to be done.
Spread the conditioners across the entire lawn. Then till them into the soil to a depth of about 5 in.
Don't think you can fix bad soil just by adding a few inches of black soil on top of the old. Instead, rent a tiller (about $45 per day) to till in the soil conditioners recommended by the soil analysis.
black topsoil over bad
soil is like putting chocolate
frosting on a stale
cake—it doesn't fix the
Bob Mugaas, Turf Expert
Level and smooth the soil with a broom rake. Then drag the rake (tines up) to create “furrows.”
Grass seed needs smooth and level ground to get the best germination. And it needs good seed-to-soil contact. So first remove all rocks and debris, then smooth the soil with a rake.
Spread lawn starter fertilizer into the furrows with a spreader. Don't overdo it.
A starter fertilizer gives grass seed the nutrients it needs to germinate and grow quickly. Consult with a local nursery to find the best starter fertilizer for the seed you select. Follow the instructions on the bag for the proper spread rate for a new lawn and apply the fertilizer.
Consult with the grass expert at a garden center to select a seed that matches your site conditions, lawn care preferences and budget. Ask about the newer low-maintenance and drought-resistant varieties. Purchase grass seed by the bag or in bulk, by the pound. But buy just what you need. Don't apply the leftover seed—extra seed actually reduces the germination rate.
Pour the seed and fertilizer into a plastic bucket and mix it thoroughly.
To avoid applying too much seed, mix the seed (4:1 ratio) with a fertilizer/ bulking agent (Milorganite is one brand; about $15 for a 36-lb. bag).
There are good and bad times of year for starting a project like this. in cold climates, plant new grass seed in early spring as the lawns are just coming out of winter (early to mid-April) or late summer from about mid-august to mid-September. in warm-weather climates, plant in late spring/early summer. if you're not sure, contact your local extension service to get planting advice from a turf expert.
Turn the broom rake upside down and drag it side-to-side over the furrows until only 10 to 15 percent of the seed remains uncovered.
Fill a sod roller halfway with water and roll the seed to pack the soil and seed mixture.
Load the seed into a spreader and apply it. Make sure it doesn't fly into nearby gardens. Rake to cover the furrows as shown. Then compact the soil with a sod roller (rent one for about $20 per day) to get good seed-to-soil contact.
Note: To learn how to use a spreader fertilizer and reseed your lawn, search for “fertilizer.”
Set the spreader to the widest setting and walk quickly to get a light application of the pellets.
This accelerator absorbs moisture and slowly releases it.
Cover the soil with compost mulch to retain water during germination. Or apply a “grass seed accelerator” (one brand is GreenView, greenviewfertilizer.com; about $22 for 30 lbs., which covers 600 sq. ft.). The accelerator absorbs more moisture than either mulch or hay and then slowly releases it. It also degrades naturally, eliminating cleanup.
Place an impact sprinkler in the corner of the lawn and set it to spray in a quarter arc. Then move it to the other corners.
Water the new lawn generously right after the mulch application, but stop as soon as you see puddles forming. Then keep the soil moist to a depth of 4 to 6 in. for best germination. Keep watering regularly as the seedlings appear and grow. Gradually reduce the watering over a six-week period. Then switch to your normal watering routine.
“Most people overwater
Just keep the soil
damp for the best
Bob Mugaas, Turf Expert
Mow the new lawn once it reaches a height of 3 in. Use a newly sharpened blade—it's healthiest for the grass. Cut just 1/2 in. per mowing.
Set the cutting height to 2-1/2 in. Use a new or sharpened blade to make sharp, clean slicing cuts. Avoid using a dull blade—it rips the grass, setting up the conditions for disease.
Note: Find out how to sharpen a lawn mower blade. Search for “sharpen blade.”
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
You'll also need a shovel, power tiller, spreader, sod roller, sprinkler and lawn mower.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.