I'm planning on building some planter boxes in the vegetable garden to put my chili & veg sprouts in (so I don't have to bend over so much). I'm wondering about the material to build it with though. I would think the side boards should be treated wood so it doesn't break down so fast in the outdoors but I know treated lumber has chemicals in it that are unhealthy to be around (that's why they are never used in indoor construction). Should they be avoided in vegetable gardening? I'm wondering if the toxins would be absorbed by the plants and make the pods unwise to eat.