I live in suburbia. My soil is worthless as they scrape everything off down to the clay (here at least it's clay), build the house and then use a flour sifter to put down 3 microns of "top soil" and throw sod down and think they've put in a lawn for you. Soooo, I have built raised beds (posted about it before) and tried to put good dirt/soil and as few chemicals as I can into the boxes. I have lined them with cardboard boxes, I lined the bottom with the plastic from the soil bags, I have used weed...lining...stuff, nothing seems to keep the damned things out. In one case the original raised bed was almost 18 inches tall and we had weeds that came up through the middle, through plastic and boxes and weed tarp. We pulled out all the beans/peas/lettuce/squash and remaining radishes that never did anything (everything produced "okay" but not super) and within a couple of weeks we had tons of weeds in the beds. So, we spent a couple hours on an already very hot saturday morning and we weeded the beds. And less than a week later we've got dozens of "volunteers" all over the beds. They are all weeds, none of them are garden sprouts. Question: How in the world do I control these damned things short of sterilizing the soil. I could probably throw some black plastic over the beds for a couple of weeks and that should kill all the seeds but some of this crap comes up through a foot or more of dirt! I'd prefer not to use harsh chemicals because after all, the point is to eat whatever we grow back there. I already use roundup around the boxes (about 6 inches out) so I don't have to weed-eat and throw clippings into the boxes but it seems like it's a losing battle. I don't want to give up though, I want to be able to grow and harvest stuff. On a related note, does anyone have any experience with actual raised beds? I mean the kind where there is a couple of feet of air under the beds and the actual growing occurs at a height were bending over is minimal. I gotta think that would cut down on the stuff growing up through the bottom, but building it so that it can support the weight might be an issue.