Answer: Heavenly Bamboo is not actually a bamboo, but the stems look like bamboo, hence the common name. Nandina, or Heavenly Bamboo, does send runners out from the roots and tends to colonize, but it is not considered invasive the way ordinary bamboo can be. If you're concerned about it overtaking the planter bed, you can plant it in a large pot and sink the pot into the ground. This will contain the roots and stop them from sending out runners. Use a large (10-15 gallon) container and your plant can stay in place for 5 or more years. At that time, unearth the container, unpot the plant, divide it, and replant. Best wishes with your garden!
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