Answer: Sasa pygmaea is a fast grower and aggressive spreader, as you have discovered. Since the plants remain short, they should not threaten the health of your maples (in terms of overgrowing them), but the bamboo will compete with your trees for moisture and nutrients. I'd dig the bamboo out of the beds and replant it in containers. You can sink the containers into the ground so you can enjoy the look of the plants without the concern that it will spread out and eventually take over the entire bed.
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