I have been growing my Garden in tires now for 4 years. I started with 10 tires to see how it would work. I now have a 162. So far it has worked better than I ever thought. It's no doubt,a no till garden. The first 3 years I would just use the weed eater around the tires. This year I've been using Round-Up around the tires and this has worked well so far. I have not found to much information on tire gardening other than some on growing potatoes and strawberries. I was wondering if anyone else has tried it. I call it a RedNeck Garden. I live in the country in Tn. You know, If you raise your Garden in old tires, You might be a RedNeck! Be sure to click on My pictures, at the top and see slide pictures. Thanks