If you put a pile of rocks on a pond liner with a pump recirculating a nutrient solution, I think you could grow a great tomato plant. I have not tried it yet, but it is on my bucket list of crazy gardening ideas to try.
Those rocks look like good exercise. Stretch first, and use good form when lifting to prevent injury. Keep your mouth open and exhale as you lift. Grunting is a good thing.
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