Leveling Low Spots in a Kentucky Bluegrass Lawn: Will Grass Grow Through Topsoil?

If you're dealing with low spots in your lawn caused by decayed tree roots, you might be wondering whether simply adding topsoil will allow your existing grass to grow through, or if reseeding is necessary. The answer depends largely on your grass type.

Cool-Season Grasses Can't Tolerate Burial

Tufted cool-climate grasses—such as Kentucky bluegrass, fescue, and perennial ryegrass—cannot survive being buried under even an inch of soil. Their central crowns require light; once covered, they suffer physiological shock and die. If your lawn consists of these grass types, you'll need to reseed after raising the grade with new soil.

Sourcing Materials and Seed

You can purchase bagged topsoil and quality grass seed at most garden centers. Opt for named, certified, or patented seed cultivars, and keep a record of the cultivar names for any future "booster seeding." Most cool-season lawns benefit from overseeding each fall to maintain a dense stand.

Timing and Watering for Success

Aim to reseed before summer heat arrives. Newly seeded areas may require watering several times a day to keep seedlings consistently hydrated during establishment. With proper timing and care, your leveled lawn will fill in beautifully.

Good luck with your project!