North Carolina State University researchers have turned a common weed into a potential weapon against rare-earth dependency. Pokeweed, known scientifically as Phytolacca americana and sometimes called dragonberries, pulls dysprosium and other rare earths from polluted soil like acid mine drainage sludge. This isn’t fantasy. It’s phytomining, backed by a new laser tool that spots metals without killing the plant.
Colleen Doherty, a biochemist at NC State, planted the weed in sludge from Superfund sites—toxic leftovers from abandoned mines. The plants sucked up rare earths, concentrating them in their tissues. Dysprosium powers hard drives, wind turbines, and EV motors. It’s magnetic magic. But traditional mining ravages southern China and Myanmar, spewing waste.
Doherty’s team built a fluorescence spectroscopy system. A deep ultraviolet laser zaps the plant. Emitted light wavelengths reveal metal levels instantly. No ashing samples. No destruction. “Fluorescence spectroscopy ‘can be done very quickly,’ and we’re excited that we can conduct the testing without destroying the plant, which allows us to test the same plant repeatedly,” Doherty said, as quoted in Gizmodo.
This lets farmers—or miners—time harvests perfectly. Peak metal load. Repeated checks on living plants. Coauthor Michael Kudenov, an electrical engineer, confirmed it works for erbium and neodymium too, with tweaks. Preliminary data covers terbium and europium. Those fuel screens, sonar, fiber optics.
Rare Earths: Everywhere Yet Scarce, China’s Stranglehold Tightens
Rare earths aren’t rare. They’re scattered, hard to gather in pure form. Doherty noted, “Rare-earth metals … these are not actually rare, it’s just that they are rarely found in high concentrations in the environment in their pure form.” China dominates 90% of processing. Destructive clays yield the goods, but at huge cost. Toxic tailings. Water poison. Ganzhou’s “Rare Earth Kingdom” leaks radionuclides into farms, as detailed in a New York Times report.
Superfund sites in the U.S. Southeast brim with these metals, trapped in sludge. Pokeweed thrives there. Hyperaccumulators by nature. Phytomining dates to the 1970s. Europe’s nickel flower farms. Africa’s startups. Now, U.S. weeds target tech metals. The NC State study hit Plant Direct with DOI 10.1002/pld3.70164; see NC State’s release at news.ncsu.edu.
But pokeweed’s no solo act. Hemp shows promise too. Belgian trials extracted metals and PFAS from polluted fields, per Hemp Today in June 2025. Industrial cannabis hyperaccumulates cadmium, lead, nickel. Up to 90% lead removal in a season. Idaho tests with Phytolacca americana alongside others yielded bio-ores rich in cerium, lanthanum—27,940 µg/g in reed canarygrass, from a 2025 Sustainability study.
UAB researchers eye genetic tweaks. Greer Dolby’s team got DOE funding to engineer “perfect strains.” Fly ash, mine drainage in Alabama, Georgia. Phytomining cleans while profiting, as covered in UAB Reporter February 2026.
And so the race builds. Plants vs. pits. Weeds turning waste into wealth.
Phytomining Scales: From Labs to Fields, Economic Edges Emerge
Challenges remain. Yields must compete with digs. Processing bio-ores via pyrolysis. Costs. A techno-economic analysis in the Idaho study pegged one-acre reed grass at $6,213 for six weeks—cultivation 39%, pyrolysis 18%. Greenhouse GHGs from power; fields from reactors. Yet lower than China’s mess.
Hemp’s role expands. Lithium uptake to 500 mg/kg in shoots, no toxicity at 50 mg/L, per 2025 Environments research. REEs next? Minnesota hunts hardy cover crops for nickel, cobalt, REEs from Duluth Complex soils.
Doherty’s optimistic. “We’re optimistic that this can make a real difference, for both our manufacturing sector and the environment.” Kudenov adds confidence for more elements. Phytolacca’s roots delve deep into sludge. Lasers light the path. Superfund scars could yield EV guts.
China’s legacy? Toxic pits like Bayan Obo, per EHN July 2025. U.S. counters with biology. Pokeweed fields. Hemp plots. Rare earths from rubble.
Fields bloom on waste. Harvests hum with value. The green transition roots here.
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