I recently sprouted seeds from summer 2015. I did nothing special beyond putting them in a small baggy. I pretty sure a small ziplock or medicine bottle would be fine for atleast 2-3 years. But I'm pretty sure they can last longer.
I have an HBD from 2014. Sprouted like a new seed and doing well... except it turns out it wants to grow as a photoperiod plant. Not sure if that's why. Anyway I store them in a ziplok dag in the fridge.
A wonderful topic whose answers are as numerous as the strains themselves. Depending on circumstances a seed can be stored 5 to 20+ years. Germination rate will diminish over time. Limited changes in storage conditions seem to foster longer storage. Airtight, cold, and dark.
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