Container Gardening question:

[Bayard]

6. Plastic holds too much water

Even with some holes drilled in the bottom, your roots will drown.

Can't beat wood. Paint or stain the outside. I'm lucky that Mr. Bayard brings these big wooden crates home from work, 3' x 4'. They get supplies shipped in from the mother country. They are hinged on the corners, open top and bottom. They stack as high as you want them, and can fold flat. That could probably be replicated.