A smart way to re-use an old spare tire is to use it in the garden. It's better than keeping it stuck forever in the garage, right? So, we made individual plots for lemons from a pile of old tires. It was filled with healthy soil and we placed bamboo sticks around it so the free range chickens won't be able to reach the plant and feed on its leaves or fruit.
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I have a few tires set up as retaining wall, and want to plant in them. Could I line them with black plastic (can't find the # for it ) or how about old pool liner?
How safe is it to use old tires as a raised garden? I know I can do flowers but just wondered about a small garden. Thanks for your help.