I thought I read once to add some soil to your compost pile, so I've been doing that. I think it's getting out of hand, though. What does everyone else do with leftover containers in the fall? I've been dumping them, soil and all, into my compost pile. My compost is now just really rich soil. Which leads to a follow up question: how do you maintain the level of your garden? If one keeps adding compost how do you keep it from becoming a mound?