ACE dates all their seeds by packing date and guarantee them for 2 years from that date. Which is reasonable as they are not in control of how they're stored after they ship them to buyers or other seedbanks. That's longer than the warranty you get from much of the grow equipment available. If stored properly seeds will be viable for much longer. I just popped a pack of ACE seeds dated 2017 and got 100% germination.
This pack of Lebanese is over 4 years old. I'll get to them within the next year and have no concern regarding their viability.
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