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According to the article, he said he "lined the inside of the boxes with a Heavy Landscape Fabric which keeps the soil from washing out but allows for good drainage. I then painted the borders and added a water sealer to the outside of the beds to give them some durability against the elements and hopefully get years of use out of them." I would assume they would need something to keep them from rotting, especially with so much water!

Thank you, I will keep that in mind. Happy Gardening