You have to use it by one week after the sell-by date imprinted on the baggie.

Seriously make sure it's in an airtight container, glass is best, that's not too much bigger than you need to fit it all in.
Keep it in the dark, in a cool place.
Your experience was probably unrelated to the fact that it was a month old.
stinkyattic Reviewed by stinkyattic on . does weed expire? ok so a few weekends ago me and my buddies finished off some stuff we've had for about a month and we all got a bad high. we were all paranoid and just crapping ourselves and my buddy's face got bright yellow. our only explanation for this is that it expired. i kept it rolled up in a plastic baggy in my drawer. so does weed expire and if so what are the best ways to preserve it? Rating: 5