I live in Cody, WY - high desert / zone 4. Our town was built on a glacier path, which means there are TONS of rocks just under our clay soil (I know - you would think the soil would be sandy, wouldn't you?) and the rocks are always pushing upward though the soil. The summer weather usually hovers around 80, but it often gets into the 90's; there is usually wind and ALWAYS no humidity. I've tried every kind of mulch for my flower beds I can find and don't like it any of them for one reason or another. I really only like the look of good, loose, black dirt / compost. So how do I find that??? (Even bags of potting soil carry small rocks and twigs.) I have 14 flower beds so I need a lot of top dressing. Any suggestions would be very appreciated.