re: Planted summer plots today

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Buckwheat can be used to clean the land of weeds. During the growing season, the fast-growing buckwheat smothers weeds, and the buckwheat residues (decomposing roots) suppress weed seed germination.

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Buckwheat grown for seed, unless carefully managed ,may result in a problem with volunteer growth of buckwheat in the following crop.

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LINK

I could see “how” it can be a problem. Easy fix is mowing it when flowering. The problem is that you can get 2 crops of it in a year and if they both go to seed and germinate the next year…. Imagine the seed per acre of buckwheat you would have blanketing the field if planted and let go to seed 2 years in a row.
You might want that or you might want a different crop to grow that can’t grow as fast as the buckwheat and it gets choked out.