Chelle I love that deep red container. I'll have to make a trip to Home Depot.
I tried a Styrofoam container this last summer. Planted a young maple with sedum and silene as ground covers. I am so happy with the results, they plant all grew wonderfully. I was going to plant the tree in the ground this last fall, but decided to keep it in the container. Now I will try finishing the outside part of the Styrofoam to make it look like stone.