I have planted three 4x4 foot raised beds with veggies.... all are filled with 6 to 8 or so inches of nice new garden soil and compost on top of tilled regular yard soil, which is pretty OK, except it did have a layer of weeds. I combed most of those out, I think. Anyway, now thinking about mulch to preserve moisture as well as keep weeds down some. I have some hay on hand and thinking of using that but I've only ever done that with strawberries. I'm wondering about pros and cons of a layer of hay as mulch.... thoughts?