Answer: It's the nature of nandinas to colonize an area by sending up new shoots from the roots near the crown of the plant. There's nothing you can do to stop this growth habit but you can dig and divide your plants. That will give each division a smaller root mass and it will take a few years for it to establish enough to begin sending up new shoots again. If you don't want to dig and divide, then you'll need to continue to snip those new shoots off as soon as they emerge from the crown of the plant.
Best wishes with your landscape!
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