The best time to aerate is between late August and early October, depending on how far north you live. Spring or summer aerification can also be successful, especially when followed with regular, frequent watering. In spring, wait until you’ve mowed the lawn twice before aerifying.
You want to aerate the lawn when your grass is in its peak growing period so it can recover quickly—think early spring or fall for cool-season grasses, and late spring through early summer for warm-season grasses.
Spring and fall are good times to aerate, fertilize and over seed your lawn so air, water, and nutrients can really penetrate deeply, softening the soil, and promoting root growth. Use a core aerator when the soil is moist and soft, not dry, and not muddy.
When to Aerate Your Lawn
If the soil is so compacted that existing grass can’t grow, it may be necessary to aerate in the spring. … But the very best time to aerate is in the fall when the temperatures have cooled off, when the weed pressure is minimal, and when grass is actively growing.
For warm-season grasses it is too late to aerate once the growing season has passed in late summer into early fall. For cool-season grasses, late fall into early winter is too late to aerate.
You wouldn’t want to aerate and overseed too early, before the last frost hits for example, and kill the seeds. You also wouldn’t want to do it during the peak of a hot summer, when the harsh sun and temperature suppress new growth. For cool-season grasses, common in northern lawns, aerate early fall or spring.
Apply fertilizer immediately after aerating your lawn to put nutrients into your grass roots. This allows the grass to better prepare for summer heat. Growing a thick, healthy lawn is useful in preventing weeds as well. Reseed your lawn, especially in areas of the lawn where the grass is thin.
No, it’s not necessary to aerate your lawn every year, especially if your grass is healthy and thriving. Aeration is good if you’ve got compacted, poor or clay-heavy soil that’s been impacted by heavy equipment or lots of foot traffic. It’s also good to aerate if you are renovating a yard or installing a new one.
It is not a must that you aerate your lawn before overseeding. However, since aeration loosens up compacted soil, improving the supply of oxygen, and provides nutrients and minerals to the new grass seed, it will improve germination and growth rates and help the grass grow thicker faster.
Stop fertilizing for at least a month before overseeding. The fertilizer makes your grass grow faster, which makes it harder for the new seeds to take hold. Identify your grass type or the type of grass you want to grow, so you can manage it appropriately.
Warm weather grasses should be aerated when the weather begins to warm. This means that aeration should occur between late spring and through the summer. … This means that aeration should occur between late summer and through the fall. Aerating these grasses during the summer heat can put stress the grass.
Overseeding is used for larger areas where the turf is thin, but not bare. The effectiveness of overseeding, whether done in the spring or fall, is enhanced when it is combined with lawn aeration. … It is helpful to core aerate before and after seeding into an existing lawn.
Plug aerators are usually more effective at relieving compaction in lawns with a heavy clay soil since the solid tines used on spike aerators compact the clay soil further when they push into the ground. … Soils that crumble easily are usually high in loam and sand which benefit more from the use of a spike aerator.
Soil temperature is the best indication of when to aerate. Studies have shown that for cool season grasses in particular, soil temperatures in the 50 — 65 degree range is the ideal time to aerate a lawn. It is when temperatures are in this range that grass roots can grow as much as 1″ a week.
While planting grass seed in November is too late to make the fall growing season, there is a method called dormant seeding. Through dormant seeding, grass seed can be planted in November when the weather is cold enough to keep it dormant until the weather warms up in the spring.
It takes proper care and regular maintenance, even in the winter. While the middle of winter isn’t the best time to aerate—since the ground is hard and grass won’t recover quickly—it doesn’t mean you can’t mentally prepare yourself and physically prepare your lawn for what’s to come.
Before you aerate, mow your lawn low (Timberline lawn experts recommend setting your mower to about 1.5-2 inches above the ground to maximize the effectiveness of aerating, being sure to not scalp the crown of the grass.) You will want to water one to three days before aerating.
Ideally, one would want to aerate a lawn in the morning 24 hours after it received rainfall or watered. This makes penetrating the soil with solid spike aerators, as well as with hollow-core aerators, much easier. It also prevents moisture from the grass and roots from evaporating too quickly.
During the first two weeks following your aeration and seeding service, the main goal is to keep the ground/seed moist while the seed begins to germinate. We recommend that you water each day for at least 20 minutes in all areas of the lawn (water the soil to a depth of about 1/4”).
If you’re looking to aerate your landscape in the spring, the best time would be between March and May. While we recommend aerating your lawn in the fall, spring core aeration may be beneficial if your turf is so compacted it refuses to grow.
Prior to aeration and seeding, a lawn should be mowed at a height of 1.5 to 2 inches. Any clippings left on the lawn after this close cut, should be bagged, blown or raked off the lawn. This is necessary to maximize seed to soil contact as the seed is spread. This is a key factor in successful germination.
If the soil is wet, you won’t want to aerate it, as it can get quite muddy. However, you also want to make sure the soil isn’t too dry either. It is typically suggested that you water a dry lawn between two days before and the evening before you aerate to ensure that the soil isn’t rock hard.
When overseeding, use compost, not topsoil. Compost provides more nutrients and moisture than topsoil. Compost breaks down to increase soil performance. Topsoil will not provide the optimal habitat for grass seeds and it won’t break down over time, leading to an unsightly, dirty yard.
The seed can be mixed with Lawn Topdressing and applied to the lawn jointly. This will save a bit of time and effort working the topdressing and seed into the surface. The seeded area must be kept moist, therefore, water your lawn after 2 or 3 days if no rain has fallen.
When seeding a lawn, you should never apply the fertilizer and seed together. This can cause an uneven distribution of the materials resulting in patchy areas or seedlings burned by excess fertilizer. It is best to spread the fertilizer just prior to planting the seed.
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