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Plants can help recover metals from soil, and plant compounds can also help produce nanomaterials—but these are distinct processes. In phytomining, metal-accumulating plants are harvested and processed to recover elements such as nickel. Plant-mediated nanomaterial synthesis instead uses phytochemicals to help turn metal ions into nanoscale materials. The available reviews do not establish that phytomining crops are routinely harvested and made into nanomaterials.
What is phytomining?
Phytomining is a form of plant-based resource recovery: growers cultivate hyperaccumulator plants on metal-rich or otherwise suitable soils, then harvest the plants and process their biomass to recover target elements. The crop is feedstock for further processing, not a finished metal product. A 2025 review describes commercial-scale implementation for nickel, while work on elements such as cobalt, selenium and thallium remains under development. New Phytologist, 2025.
How do plants extract metals from soil?
Hyperaccumulator plants take up and concentrate particular elements as they grow. In nickel phytomining, the documented pathway is to grow plants on nickel-bearing soil, harvest the biomass and incinerate it. The resulting metal-rich ash, or bio-ore, can then be processed to recover nickel metal or salts. A review of noble-metal phytomining likewise describes a sequence of phytoextraction, enrichment and extraction from biomass residues or incineration ash, while noting that recovery from solid residues was less understood than earlier stages. Plant and Soil review, 2016; noble-metal phytomining review.
Which plants and soils have been studied?
A 2016 review said the nickel-phytomining agronomy of fewer than 10 species had been tested by that publication date, with much of the work focused on Alyssum murale and Alyssum corsicum. The review records trials in Albania, Canada, France, Italy, New Zealand, Spain and the United States on soils containing 0.05–1% total nickel. Those are reported trial locations and soil concentrations, not evidence that projects are currently operating in every country listed. Nkrumah et al., 2016.
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What can affect nickel yield?
Biomass production and the concentration of nickel in shoots both matter to the amount recoverable. The 2016 agronomic review reports that nitrogen, phosphorus and potassium fertilization increased biomass with negligible dilution of shoot nickel concentration in the studies it examined. It also reports that organic matter could increase biomass while reducing nickel concentration. These findings are specific to the reviewed studies, not universal fertilizer recommendations; local soil and growing conditions need to be evaluated.
Are hyperaccumulator plants harvested to make nanomaterials?
Not as a standard phytomining step established by the sources reviewed. Plant-mediated nanomaterial synthesis is a separate research method: compounds in plants or plant parts can reduce metal ions to form nanomaterials. A 2021 review preprint discusses potential applications including biosensing and drug delivery, as well as challenges in synthesis methods. It does not show that biomass from phytomining operations is routinely used as the material for that synthesis. 2021 review preprint.
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The distinction is practical as well as terminological. Phytomining aims to collect and recover elements from a crop; plant-mediated synthesis uses phytochemicals in a reaction that produces nanoscale material. A particular study could investigate using harvested plants or their residues in a nanomaterial process, but that would need to be demonstrated for that study rather than inferred from the fact that both methods involve plants and metals.
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There is no universally best crop or recovery route. A 2025 review identifies three central economic conditions: a locally suitable hyperaccumulator that provides useful biomass and metal accumulation; sufficient value in the target element; and enough land with soil sufficiently enriched in that element. Agronomy and the cost and effectiveness of downstream recovery also shape the case. New Phytologist, 2025.
- Target element: Commercial maturity differs by element. The 2025 review identifies nickel as having reached commercial-scale implementation, but says prospects for cobalt, selenium and thallium remain under development.
- Local species and yield: A plant must suit the site and accumulate enough target metal while producing harvestable biomass.
- Soil and area: The soil must contain enough of the target element across a sufficiently large area for cultivation and recovery to be viable.
- Post-harvest recovery: Incineration and recovery from bio-ore are described for nickel; other elements and residues may require different processes, and not every route is equally well understood.
- Agronomic conditions: Soil management and growing conditions can change biomass and metal concentration, so results from one crop or study should not be treated as a site-independent recipe.
What the evidence supports—and what it does not
Phytomining is a real resource-recovery approach, with commercial-scale implementation reported for nickel. It is not accurate to generalize that status to every metal accumulated by plants. Nor does the existence of plant-mediated nanomaterial synthesis establish that phytomining crops are routinely converted into nanoparticles. These should be treated as related but separate technologies unless a specific operation or study demonstrates a direct connection.
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