I used roofing tin for some of mine. I have pressure treated wood as the frame on the outside but it doesn’t touch dirt.What are y’all’s thoughts on pressure treated lumber for raised beds? Wife wants to add more real estate to the garden this spring. Reading mixed opinions. I’m reading they changed the treatment and it’s mostly copper. Cedar doesn’t seem to last like it used to. I’m thinking they grow the trees so fast they don’t have as much of the good oils in the wood,