
By Jon Tharp, Broker · July 16, 2026
At a Glance
Hammerhead worms are invasive flatworms with a half-moon head that have been in North Carolina since at least 1951 and are turning up in Jackson County gardens. Never cut one, because each piece can regenerate into a new worm. Instead, use gloves to seal it in a bag with salt or vinegar, or freeze it. Their mucus contains a neurotoxin that can irritate skin.
If you have been turning over mulch or watering the beds this summer around Jackson County and spotted a long, ribbon-like worm with a flat, half-moon head, that is not your imagination playing tricks. It is a hammerhead worm, and a recent piece from the Jackson County Cooperative Extension office is a good reminder that this odd invasive has been living in our soil for decades.
Sylva sits about an hour southwest of Asheville on US-74, and the humid mountain summers here make good conditions for these flatworms to show up in flower beds and shady spots near the foundation. If you garden anywhere from Cullowhee to Dillsboro, this is one worth knowing about.
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