My wife and I want to go the raised bed route. 3 boxes of 3'W x 10'L x 3H. I'm planning on using 1 x 6 planks of cedar, with 4x4 posts in 4 corners as well as in the middle (for added support). My concern is around the posts. I've been reading up on treated lumber and there seems to be several schools of thought. One says that you should never use it at all. Another is to use treated wood and just wrap it in 4mil plastic. Last one is saying treated is fine because they use copper now as opposed to arsenic.
This is my first foray in to gardening, so I want to make sure I'm not going with something that will leech toxins in to what we plant.
What do the green thumbs here use?
