Farm-raised golden oyster mushrooms are spreading through U.S. forests and outcompeting native fungi [1].
This ecological shift threatens the balance of forest ecosystems by reducing the richness of fungal communities. Because these mushrooms play a critical role in nutrient cycling, their dominance can alter how forests decompose organic matter.
The golden oyster mushroom, known scientifically as *Pleurotus citrinopileatus*, is native to the hardwood forests of Russia, China, and Japan [1], [2]. However, the species has become invasive in the United States, with significant sightings reported in Michigan [4].
Researchers said the spread is largely driven by the mushroom's popularity as a home-grown food source [2], [5]. Because they are easy to cultivate, accidental releases from home gardens and commercial farms have allowed the fungi to establish themselves in the wild [2], [3].
Once introduced to a forest, the golden oyster mushroom uses its ability to decompose lignin and cellulose to gain a competitive advantage [2], [5]. This efficiency allows it to displace native fungi that typically perform these roles, a process that lowers overall biodiversity in the soil and on decaying wood [1], [5].
Studies documenting this invasive trend were published in July 2025 and have continued to be reported this month [1], [2]. The ability of the species to thrive in various hardwood environments makes it a persistent threat to local fungal populations [4].
“Farm-raised golden oyster mushrooms have escaped cultivation and are spreading in wild forests.”
The transition of the golden oyster mushroom from a culinary crop to an invasive species highlights the ecological risks of the 'home-growing' trend. When a species optimized for rapid growth in cultivation enters a wild system, it can create a biological monopoly, stripping away the diversity of native fungi that other forest plants and animals rely on for survival.
