Answer: 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 your Plum Passion is getting out of hand, you may want to dig and divide the plants, then replant after placing a root barrier in the bed. I use plastic edging (available at garden centers) to contain the roots of my Nandinas. You could do the same. Best wishes with your garden!
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