One trick for leveling small depressions or holes covered with healthy grass is to cut out a patch of the turf and add the soil mix underneath it, then lay the patch back down. Known as sweeping under the carpet, this is a handy technique for leveling localized depressions without having the unsightliness of exposed soil on the grass, which happens with the other methods. Whichever method you choose, spring is the best time to level your lawn, as the conditions are mild, giving the lawn a chance to recuperate before summer’s heat arrives.
Minor Leveling With Topdressing
Topdressing involves spreading a leveling mix of topsoil, compost, and fine sand. The soil should not contain mulch or plant debris, which can smother the grass. The best sand to use is play sand, which you can buy at any home center. A typical mixture is 40 percent sand, 40 percent topsoil, and 20 percent compost. The sand provides good drainage, while the compost adds nutrients to the soil to promote grass growth.
Sweeping the Dirt Under the Carpet
This technique is so named because you are essentially picking up turf (the carpet) and putting dirt under it. It is suitable only for small sunken areas that are covered with healthy grass.
Leveling Deeply Sunken Lawn Areas
If you have depressions, troughs, or holes that are deeper than 1 or 2 inches, you’re usually better off filling them with a good soil mix and starting over with new grass seed. Bringing up deeply sunken areas with topdressing takes too many applications, and you’ll spend more time trying to keep the grass alive than you will getting new grass to grow. The trick to filling deep holes is to compact the soil gently and give it some water to settle it as you fill up the hole. If you simply pile on some loose dirt and plant your seed, the soil will settle, and you’ll be left with sunken area covered with nice, new grass. Walking on the soil is enough to compact it. Don’t compact the top-most soil where you will sow the grass seed. Prepare the soil and seed the area following the seed product instructions.
