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I have 10 acres of fields and one is bordered by woods and birds use it. I do not mow it until mid june at the earliest and some years July. I am in southern Ohio and figure our birds should all have hatched by mid June. After that I keep it mowed short. I played around with this for years and it seems like the hens and poult like the short grass to bug in. I see more activity when it's short, and it's not just because I can see better.
Unless you have a pure white clover plot that requires frequent mowing, mowing should be abandoned in favor of crimping and can be done after nesting periods …. https://youtu.be/9Amh6yzFwB0