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If your lawn hasn't been aerated in over a year, or the soil is incredibly compacted, do two passes with the aerator. The first pass should follow your mowing pattern and the second one should form a perpendicular angle relative to the first. Stick to 20 to 40 holes per square foot as a rule of thumb.

Post-seeding care involves regular watering, mowing when appropriate, and occasional re-seeding to cover sparse areas.

No. Both processes are important for a healthy yard and work toward a similar goal, although dethatching serves a slightly different purpose. Making sure the thatch doesn’t grow too thick prevents other lawn problems, such as attracting pests if the plant decay layer gets too big. Aeration puts less strain on your lawn than dethatching, but both are of equal importance.

If your grass is stressed from being over-trimmed, try watering it heavily and then allowing it to recover for at least two weeks before mowing again. If you notice brown patches where the grass has died off because it’s too short, you should remove the dead grass and overseed the area. Leaving dead patches can invite weeds and other problems, so if you want a totally green lawn, getting rid of dead patches should include removing the dead sections before reseeding the area.