How to Store Wood Ear Mushrooms to Keep Them Fresh and Safe

Black fungus—also known as wood ear or *Auricularia auricula-judae*—is a nutrient-rich edible mushroom widely used in Asian cuisine and traditional medicine. Its delicate texture and mild flavor make it a versatile ingredient, but its high moisture content renders it highly perishable when fresh. Proper storage is essential to preserve quality, prevent microbial contamination, and retain nutritional value.

Fresh black fungus should be refrigerated immediately after purchase or harvest. Store it unwashed in a breathable paper bag or loosely covered container in the crisper drawer at 0–4°C (32–39°F). Under these conditions, it remains safe and palatable for up to five days. Avoid sealing it in airtight plastic, as trapped moisture encourages bacterial growth and spoilage.

For longer-term preservation, drying is the most effective and traditional method. Spread freshly cleaned caps in a single layer on a clean, food-grade drying rack in a well-ventilated, shaded area—or use a food dehydrator set to 40–45°C (104–113°F) until completely brittle (typically 6–12 hours). Fully dried black fungus contains less than 12% moisture and can be stored in an airtight, opaque container in a cool, dry, dark place for up to one year without significant loss of polysaccharides, dietary fiber, or iron content.

Reconstituted black fungus—soaked in cold water for 2–4 hours—must be used within 24 hours if refrigerated, or cooked immediately. Never soak it overnight at room temperature, as ambient conditions may promote the growth of *Klebsiella pneumoniae* and other opportunistic pathogens associated with rare but serious cases of foodborne illness linked to improperly handled rehydrated fungi.

Freezing is not recommended for fresh or rehydrated black fungus due to ice crystal formation, which disrupts cellular structure, leading to mushiness, reduced viscosity of its characteristic β-glucan gel matrix, and diminished textural integrity upon thawing. Commercially processed frozen black fungus products are typically blanched and stabilized with cryoprotectants—a process not replicable in home settings.