Are dried mushrooms still edible if soaked overnight?

Generally, whether dried mushrooms soaked overnight are edible depends on the soaking conditions. They can be consumed if soaked in a cold, refrigerated environment without signs of spoilage; however, they should not be eaten if soaked at room temperature for an extended period or if there are signs of deterioration. The details are as follows:

If dried mushrooms are soaked in a refrigerator at 0–4°C and show no unpleasant odor, sliminess, and the soaking water remains clear after soaking, they are generally safe to eat. The low temperature inhibits bacterial growth, so soaking overnight does not significantly affect their quality. Simply rinse them thoroughly before cooking.

If dried mushrooms are soaked at room temperature overnight or exhibit signs of spoilage such as unpleasant odor, slimy texture, cloudy water, or mold growth on the surface, they should not be consumed. At room temperature, bacteria can multiply rapidly and may produce harmful substances, which could lead to gastrointestinal discomfort if ingested.

For daily preparation, it is recommended to limit soaking time to 2–4 hours and preferably use refrigerated soaking. If prolonged soaking is necessary, change the water frequently. Always carefully inspect the mushrooms for quality before consumption, wash them thoroughly, and ensure they are fully cooked to avoid health risks from spoilage or residual impurities.