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Registered FedEx Sender
Join Date: Jan-2004
Location: Ottawa, KS
Country: USA
Posts: 1,726
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CCA lumber leaches cyanide into the soil and your hands. I recommend cedar or redwood, especially if you have some scraps left over after building a deck or fence. But you can use anything, even an old drawer from a dresser, if you put drainage holes in it. If you want an extremely shallow one, it's easy enough to build one from 1X material.
Pond baskets are becoming very popular as a way to promote fast growth and prevent too-large roots. It all depends on the size of the tree.
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