I'm new here so please forgive if you all discussed this last year, but how do you know if mulch hay is safe? I'd like to get a couple bales of hay, or better yet seed-free straw, for mulching potatoes and peppers. I've always heard that hay is THE thing for mulching. But how do I know if the hay is safe and doesn't have broad-leaf weed killers in it?
Kathy