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How to Improve Clay Soil in an existing lawn

Our lawn was planted by the builder on hard clay soil in Southwestern PA. The grass is growing, but between watering the soil is very hard and develops cracks. I am in a condo association so cannot redo the lawn, but can do some things myself. Is there anything I can do to improve the soil over time? I have read about various liquid aerators like Trufmax2 and Aerify Plus. Are these effective? Any other suggestions would be appreciated. Thanks!
Submitted by pkwaug

The best thing you can do is use a core aerator. This is part of good lawn care anyway, but not everyone does it. Even if you do, it's generally done just once a year, but it can be done twice a year with no problem. Do it when the soil is really moist to make sure you are pulling deep plugs.

I have not tried many of the liquid aerators so i cannot answer for every one on the market. However, my limited experience with products that claim they'll relieve compacted clay has been disappointing. Compaction is a  physical problem and requires a physical solution -- tilling, or core aerating.

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