Answer: Most bamboos have extensive root systems that would soon outgrow a modest container. There are a few clumping varieties that you can use in planter boxes. Length and width isn't so much an issue as is soil depth. The following bamboos would be especially happy in very deep (24"-30") soil within the planters you describe. Bamboo 'Alphonse Karr' grows 8'-10' at maturity, 'Golden Goddess' grows 6'-8' tall, Phyllostachys aurea (Golden Bamboo) is a running type bamboo, but grow 6'-10' tall and is well adapted to containers. P. nigra, or Black Bamboo, is especially attractive and well behaved, growing about 8' in height. Bamboo grows rapidly once established, so start out with small plants and you'll soon have the coverage you want.
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