Answer: There are two types of bamboo - running and clumping. Running bamboo can escape cultivation and cause reall problems in a landscape. Clumping bamboo is easier to contain because the root system remains in a compact area rather than sending root out long distances. Since you are planting in a raised planter box, the roots of your bamboo should remain in a specific area rather than invade the garden. Just be aware of any roots that try to escape through the drainage holes in the bottom of the planter box. You won't need to line the planter, in fact doing so could block the drainage holes and kill your bamboo. Bamboo is like a giant grass and you can take starts from an established plant by simply dividing the clump with a shovel. Make sure you get both tops and roots with each division. Best wishes with your bamboo.
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