Can soaked shiitake mushrooms be kept until the next day?

Generally speaking, whether soaked shiitake mushrooms can be kept until the next day depends on the storage method. They can be saved for the next day if stored sealed in the refrigerator and show no signs of spoilage, but should not be kept if left at room temperature or already spoiled. The details are as follows:

If the soaked shiitake mushrooms are drained well, wrapped in an airtight container or plastic wrap, and promptly refrigerated, they may still be safe to eat the next day provided there is no unpleasant odor, stickiness, discoloration, and their texture remains firm and plump—indicating no bacterial growth. They should be thoroughly cooked before consumption.

If the soaked mushrooms are left overnight at room temperature or stored in the refrigerator without proper sealing, they are prone to microbial contamination due to air exposure. If they develop sour or foul odors, become soft, mushy, sticky, or appear grayish on the surface by the next day, they have likely spoiled and should not be consumed, as eating them may cause gastrointestinal discomfort.

In daily preparation, it's recommended to soak and use shiitake mushrooms immediately, avoiding prolonged storage. If leftovers must be kept, ensure they are tightly sealed and refrigerated, and do not store for more than 24 hours. Always carefully check their condition before consumption and cook them thoroughly to ensure food safety. The soaking water can be used for soups if it remains clear and odor-free; otherwise, it should be discarded.