Do not buy or eat mushrooms past the printed expiration date. Sniff the mushrooms. Mushrooms sold individually will not have printed expiration dates, and you can use your nose to make up for that. ... A slimy or viscous residue means the mushrooms have gone bad. read more
The shelf life of mushrooms, like most other fresh vegetables may not have a sell by date, use by date, or best before date so you have to go with purchase date in most cases. read more