Your comment reminds of a situation once a number of years ago.  Was standing in the shop with a farmer talking about cover crops.  He harvested his wheat and wanted to know what he could/should plant as a cover crop.  I look in the corner and see several bags of leftover soybeans.  I ask him what he is going to do with those soybeans.  Said he wasn't sure, might try to plant them next year.  I said "plant those".  He looked at me funny and said "But I wanted to plant a cover crop?"  No problem, just don't harvest them, you've got your cover crop!  Was a pretty funny epiphany for him.