Research & technology
Can Oyster Mushrooms Turn Textile Waste Into Building Materials?
7 min read
Could an oyster mushroom help turn worn-out clothing into insulation? A study published in October 2026 grew Pleurotus ostreatus through shredded post-consumer textiles and oak pellets, harvested fruiting bodies, and tested the remaining mycelium-bound material as an experimental composite.
The work is genuinely unusual because it used a mixed, largely synthetic textile stream rather than clean cotton alone. It is also preliminary. The study did not establish that mushrooms grown on discarded clothing are safe to eat, that polyester was biodegraded, or that the composite is ready to replace certified building insulation.
What the researchers actually used
The research team obtained roughly one kilogram of post-consumer clothing from a Polish textile recycler. Buttons and other hard pieces were removed, and the fabric was shredded into particles smaller than 15 millimeters. The clothing was not washed, dry-cleaned, or decontaminated before the experiment.
Based on garment labels, the textile fraction was estimated to be about 58 percent polyester, 25 percent cotton, 4.5 percent nylon, and smaller amounts of other fibers. Those percentages were label-based estimates, not a laboratory separation of the mixed material.
Researchers prepared four substrates: all oak pellets; 70 percent oak pellets with 30 percent textiles; an even oak-textile mixture; and all textiles. Each formulation had six biological replicates and received oyster-mushroom grain spawn.
The fungus grew—but the textiles reduced mushroom yield
Oyster-mushroom mycelium colonized all four mixtures, including the 100-percent-textile treatment, and every formulation produced fruiting bodies. That shows that the mixed clothing did not completely prevent growth.
Yield fell sharply as textiles replaced oak. Reported biological efficiency was 55.18 percent on the all-wood control, 28.50 percent with 30 percent textiles, 23.84 percent with 50 percent textiles, and 19.53 percent on textiles alone. The textile-rich treatments also produced proportionally weaker second flushes.
The likely explanation is not that the fungus was feasting on polyester. Oak and cotton can provide accessible plant-derived material; polyester and nylon are difficult or essentially undegraded during a cultivation cycle. The synthetic fibers mostly acted as inert filler while also changing porosity, water retention, and aeration.
How mycelium turns loose waste into a composite
Mycelium grows as a network of microscopic hyphae. As those threads spread through loose particles, they wrap around and bind the pieces together. Once the formed material is dried or otherwise deactivated, it can behave like a lightweight biological foam.
This binding function is different from completely digesting the textile. A useful panel can contain fibers that remain chemically intact. The fungus acts partly as a grown binder, while the shredded textile and wood form the bulk structure.
That distinction is central to the study. It demonstrated a route for incorporating mixed clothing into a new material, not proof that oyster mushrooms converted polyester and nylon into harmless biological matter.
What the material tests showed
The team performed exploratory compression and thermal-decomposition tests on the resulting composites. Changing the textile-to-wood ratio changed how the samples deformed and carried loads, suggesting that the material could be tuned for different nonstructural uses.
Mycelium-modified samples also began thermal decomposition at higher temperatures than the wood-only reference in the reported thermogravimetric test. That is useful characterization, but it is not the same as a building-code fire test or proof that a wall panel is fire safe.
The authors explicitly describe the measurements as preliminary. The porous specimens challenged the testing equipment, some mechanical values could not be determined, and the modified test geometry did not amount to full standardized qualification.
Why the harvested mushrooms should not be treated as food
The experiment produced recognizable oyster-mushroom fruiting bodies, but appearance is not a safety test. Post-consumer textiles can contain dyes, finishing agents, plastic additives, stain treatments, residues from use, and compounds that were not included in the study’s limited elemental analysis.
The researchers measured selected metals. Cadmium, lead, cobalt, and nickel were below the method’s quantification limits, while zinc, iron, and copper were detected and generally increased in fruiting bodies from the highest-textile treatment. The paper says these measurements characterize the biomass and should not be interpreted as a dietary-safety assessment.
No comprehensive chemical screen, food-safety protocol, or feeding study was reported. This research therefore does not support growing food mushrooms on old clothing at home or eating the fruiting bodies from such a process.
The composite is not automatically compostable
Mycelium, wood, and cotton are biodegradable portions of the material. Polyester, nylon, pigments, and inorganic additives are another matter. When the biological matrix eventually decays, persistent fibers and chemicals can remain or leach into the environment.
The study specifically warns that these mixed-textile composites should not be described as freely compostable. The authors instead envision a managed technical cycle that keeps the material contained, extends its useful life, and controls its eventual disposal.
A circular-sounding ingredient list does not establish a circular product. A complete assessment would need to track preprocessing, sterilization, cultivation energy, drying, service life, coatings, moisture damage, reuse, and end-of-life handling.
What still has to be tested
- Standardized thermal conductivity, compressive strength, dimensional stability, and fire-behavior tests.
- Long-term performance under changing humidity, temperature, insects, mold exposure, and repeated wetting.
- A broader chemical analysis of dyes, finishes, additives, and any compounds released during processing or use.
- Consistent manufacturing with larger batches and genuinely variable post-consumer textile streams.
- Life-cycle comparisons with conventional insulation and with simpler textile-recycling options.
- A controlled end-of-life plan for persistent synthetic fibers and additives.
Those are major engineering and safety questions, not finishing touches. Other mycelium-composite studies show that substrate, fungal species, density, growth conditions, and post-processing can change performance substantially, which is why standardization remains a central challenge for the field.
Bottom line
Yes: oyster-mushroom mycelium grew through a realistic mixture of shredded clothing and bound it into a lightweight experimental material. The result supports further investigation of textile-mycelium composites for insulation or other nonstructural applications.
No: the experiment did not show that oyster mushrooms fully biodegraded synthetic clothing, produced food proven safe to eat, or created a certified replacement for conventional insulation.
The most useful insight is more modest and more practical: fungal growth may provide a low-temperature way to bind difficult waste into a new form. Whether that form is safe, durable, economical, and preferable to other recycling routes still has to be demonstrated.
Research note
The primary study was published in Frontiers in Bioengineering and Biotechnology on October 8, 2026. It used six biological replicates for each of four substrate formulations. Textile material was supplied by VIVE Textile Recycling; one author listed affiliations with that company and a university. The paper reports support from Jan Kochanowski University and VIVE Innovation and declares no competing commercial or financial relationships.