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I'd stay away from pressure treated lumber, especially if you are growing anything you are going to eat, but even regular plants would be sensitive to the chemicals in it. There is also the problem that the chemicals will very quickly rust nails and screws unless they are hot-dip galvanized. The best thing would probably hardwoods with an outdoor finish and some kind of plastic inserts so that the only water coming into contact with the wood would be the occasional spill, which could just be wiped up. If you look at the link Fransikaner provided, they are basically heavy plastic. I'd just find some plastic pots in the shapes you like and build a frame around them.

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