Wild mountain plants sort into metal-trapping and metal-pulling specialists
Moradkhani P, Jalali M
Phytoremediation
If you've ever wondered whether the scrappy weeds growing on an old mine site or industrial lot could actually help clean the ground, this study shows specific native plants can do exactly that, some by burying toxic metals safely in their roots, others by hauling them up into leaves you could later harvest and remove.
Scientists studied 11 plants growing wild at a lead-zinc mine in Iran to see how they handle toxic metals in the soil. They found two useful strategies: plants like woundwort and a groundsel species keep the metals trapped in their roots, acting like natural barriers, while yarrow and a few others pull the metals up into their stems and leaves, essentially vacuuming toxins out of the soil. Yarrow was the standout, concentrating iron in its shoots at three times the level found in the ground below it.
Key Findings
Soil at the mine site contained cadmium, copper, and nickel at 198x, 124x, and 86x normal background levels respectively.
Stachys inflata and Senecio gallicus kept toxic elements concentrated in roots rather than shoots (translocation factor below 1), making them candidates for stabilizing contaminated soil in place.
Achillea millefolium (yarrow), Phlomis olivieri, and Euphorbia szovitsii pulled metals up into shoots (translocation factor above 1), with yarrow reaching a translocation factor of 3.03 for iron, making them candidates for active metal removal.
chevron_right Technical Summary
Researchers tested 11 wild plants growing at an Iranian lead-zinc mine and found some species lock toxic metals safely in their roots while others pull metals up into their leaves and stems, offering two different tools for cleaning up contaminated mining soils.
Abstract Preview
Original paper
Evaluation of the Capacity of Eleven Plant Species to Accumulate Potential Toxic Elements and Macronutrients in a Lead-Zinc Mining Area for the Purpose of Remediating Contaminated Soils.
The presence of potential toxic elements (PTEs) in water, soil, and plant resources poses a significant risk to human health. A field investigation on the content of PTEs and macronutrients in soil...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Ancient Amazonian forests were planted and tended by Indigenous farmers
Forests and fruits we romanticize as wild — including many plants now in our kitchens and gardens — may exist in their current abundance precisely because an...
Achillea millefolium, commonly known as yarrow or common yarrow, is a flowering plant in the family Asteraceae. Growing to 1 metre tall, it is characterized by small whitish flowers, a tall stem of fernlike leaves, and a pungent odor.