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Answers.comÂ® is making the world better one answer at a time. no...salt, sugar, flour...none of these expire. your epsom salt package might have an expiration date..probably indicating shelf life....generally how long it can be expected to remain on a shelf before it's effected by moisture.
It has to cool before you put spores near it by the way. An airtight container will keep spores indefinitely. Add a 1/4 inch layer of the dessicated epsom salt to the bottom of the canning jar and seal it for at least an hour but up to several weeks.Adding a rolled up bundle of hopefully sterile aluminum foil/mushroom spore print to the dessicated jar will remove the primary danger which is water to it decomposing or dying.dd a 1/4 inch layer of the dessicated epsom salt to the bottom of the canning jar and seal it for at least an hour but up to several weeks. Adding a rolled up bundle of hopefully sterile aluminum foil/mushroom spore print to the dessicated jar will remove the primary danger which is water to it decomposing or dying.