Any of various weeds that grow in or contaminate hay fields, reducing the quality of harvested hay.
Simple compound of 'hay' (dried grass) and 'weed' (unwanted plant). Agricultural term that emerged as hay farming became systematized in medieval Europe.
Farmers have fought hayweed for thousands of years, and now modern agriculture uses more pesticides fighting the same problem—but ancient farmers had techniques like crop rotation that actually worked!
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