Forgot to add...

I am not going to put anything up on the walls. What I was going to use was a large single sheet LIKE an emergency blanket for campers... Foil just being a common term...

The main reason I was going to put anything up was to prevent the walls from getting water, etc on them just in case I needed to remove the plants at some time. But, I think I can keep the area clean enough and I may just lean some white poster board around the lower walls.

I will post pics when I have the area set up.