How to Thicken Grass

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Plant new grass seeds for a thicker lawn.
Plant new grass seeds for a thicker lawn. (Image: Comstock/Comstock/Getty Images)

Every lawn owner works to achieve an attractive lawn that is lush, green and thick. However, lawn grass is sometimes sparse, with noticeable patches, in spite of healthy maintenance practices. The remedy for this problem is to reseed so new grass can fill in the thin areas and make the lawn look thick. It is best to plant new seeds in the fall when there are fewer weeds to compete with grass seedlings.

Things You'll Need

  • Mower
  • Rake
  • Verticutter or dethatcher (optional)
  • Grass seeds
  • Seed spreader
  • Fertilizer

Adjust the mower to the lowest setting and cut the grass to a height just above the soil. Cutting grass to this height loosens the soil for seeding.

Remove any buildup of debris between the grass blades. Thick layers of cut grass and other debris stop the smooth flow of water to the grass roots. Rake the debris out or, if it is thick, use a verticutter or dethatcher to lift it out. You can rent these machines from a home and garden center. Rake the debris off the grass after using the machines.

Loosen the soil further with an aerator. Oxygen and moisture can flow through loose soil more easily.

Pour the grass seed into a seed spreader. Spread the seed over the lawn at the rate recommended by the seed manufacturer. Apply up to three times the recommended rate on bare areas. Rake the seeds into the soil at a depth of up to 1/8 inch. Press the soil down with the head of the rake to make it firm and secure the seeds. If you are reseeding in the summer months, apply a light layer of mulch to protect the seeds from birds and retain soil moisture.

Apply fertilizer to the soil according to the rate and quantity recommended by the manufacturer. Send a soil sample to a professional laboratory if you are not sure of the type of fertilizer to apply.

Water the lawn frequently until the grass grows. Each time, apply a light amount of water that is just enough to keep the soil moist. When the grass is established, resume regular lawn maintenance practices.

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