You just had your lawn overseeded. Now what should you do about mowing?

One of the most important things you can do after overseeding is give the new grass time to establish before mowing. Newly germinated grass is extremely fragile, and mowing too soon or too aggressively can damage seedlings before they have had a chance to develop.

Why Mowing After Overseeding Requires Extra Care

When grass seed first germinates, the young plants have very small root systems and tender leaf tissue. They simply aren’t strong enough to handle the same traffic and mowing practices as an established lawn.

Walking across newly germinated grass can damage seedlings. A mower adds considerably more weight, and turning the mower can twist or tear young plants from the soil.

The goal during the first several weeks is simple: disturb the new grass as little as possible.

How Long Should You Wait to Mow After Overseeding?

We recommend avoiding mowing for the first couple of weeks after overseeding and waiting longer when possible.

Don’t worry if your existing grass gets longer than you would normally allow. It is okay for the established grass to reach approximately 5 inches while you’re waiting for the new seedlings to develop.

In this situation, protecting the new grass is more important than keeping the existing lawn perfectly manicured. The longer you can reasonably wait, the more opportunity the seedlings have to develop stronger roots and become better anchored in the soil.

Your First Mowing After Overseeding

When it is finally time to mow, be gentle. Raise your mower to its highest mowing setting for the first several mowings. You want to remove as little of the grass blade as possible while allowing the lawn to gradually return to a normal mowing schedule.

It is also important to:

• Use a sharp mower blade. A sharp blade makes a clean cut instead of pulling or tearing the young grass.
• Mow when the lawn is dry. Wet soil is softer, making it easier for mower tires and foot traffic to disturb seedlings. Wet grass also tends to clump and mow poorly.
• Make wide, gentle turns. Tight turns are particularly damaging because mower tires can twist against the soil and tear young seedlings.
• Limit unnecessary traffic. Walking, pets and lawn equipment can all damage young grass while it is becoming established.
• Avoid removing too much at once. Even if the established grass has become tall, don’t try to immediately cut it back to your normal mowing height. Gradually lower the height over future mowings.

Be Careful for More Than Just the First Mowing

One of the biggest mistakes homeowners make is assuming that once they have completed the first mowing, they can immediately return to their normal mowing habits.

We recommend continuing to mow carefully for approximately two months after overseeding. During this establishment period, avoid aggressive turns, mow when conditions are dry and minimize unnecessary traffic across newly seeded areas.

As the new grass develops a stronger root system, it will become much more tolerant of normal mowing and everyday lawn traffic.

Should You Bag the Grass After Overseeding?

In most cases, there is no need to bag your clippings. As long as you are mowing frequently enough that you are not leaving large clumps of grass behind, returning the clippings to the lawn is perfectly fine.

If the existing grass became particularly long while you waited to mow, however, you may have excessive clippings. In that situation, bagging or removing heavy clumps can help prevent them from covering the young seedlings.

Don’t Stop Watering Because You Started Mowing

The first mowing doesn’t mean your new grass is fully established. Continue following the watering recommendations provided for your newly seeded lawn. Young grass still has a relatively shallow root system and can dry out much more quickly than mature turf.

The Most Important Thing: Give the New Grass Time

After overseeding, it is normal for your lawn to look a little longer and less manicured for a while. That’s okay.

Your priority during this period isn’t having a perfectly mowed lawn. It is giving thousands of new grass seedlings the opportunity to become established.

Wait as long as reasonably possible before the first mowing, raise your mower to its highest setting, make gentle turns and continue treating the lawn carefully for the first two months.

A little patience now can make a significant difference in how successfully your newly overseeded lawn establishes.