I read some where that invasive bamboo should have a 3' deep
barrier to contain it from spreading to undesirable locations.

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For most bamboo, and all larger species, 3" is much to shallow.
Twelve inches is recommended, and the runners can go deeper than
that if the soil is moist.

Jim Lewis - - Tallahassee, FL - Our life is
frittered away by detail . . . . Simplify! Simplify. -- Henry
David Thoreau - Walden

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