The downside is when the weeds get to taking over. Then the stone has to be moved out of the way, or I have to spend hours pulling theweeds out, one by one. I usually put down newspaper (several sheets thick), then mulch, then my rocks. But after a year, or two, the newspaper and mulch break down, dirt blows in, and the rocks are just in the way of weed pulling. My project this week is putting down more newspaper, more mulch, and finding the rocks that have sunk into the earth. Messy job, but what beautiful results!