Mychorrizhae expiration date?

So on a trip to my local shop to get a buddy started with his first grow I had interesting interaction with a shop hand.... My buddy was going to buy a bag of myco and it had an expiration date on the back that was 2 months old... The guy told my buddy to disregard that and still buy that bag anyways. Did my buddy get ripped off? Are they non-active bacteria after this date or are they more harmful? Could be a situation if its the latter of the two because any negative effects to the plant are negative effects to the smoke. Why would this guy give us wrong info they do not just put a exp sticker on a bag for shits and gigs.... please let me know if this is harmful bacteria now or if it just does nothing...Happy burnin

For real no one knows if this is harmful or just not even gonna work?

It's likely the myco is still alive. At worst, they'll be dead and still feeding your plants

K just wanted to make sure my buddy wasn't exposing his plant to plant AIDS or some shit... thanx tho

they are spores exp. date means very little. ive been using the same spores for years......

Most nutes and additives do not have expiration dates, they have production dates or numbers. I know with Fox Farm Microbe I was told it has a 2 year life.

Much like breweries that place a "born on date" on their packaging for beer, companies that sell Myco. have 2 reasons to put the dates on the bags. First, as a means to track production of the product by batch/lot numbers etc. Secondly, this can be a motivator for the consumer to buy more product. If they are under the impression that the spores are no longer viable, they are much more likely to purchase fresh products. As long as the Myco.has not been exposed to moisture (still sealed) it is highly unlikely that it will lose any its effectiveness.