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Freezing seeds extends viability for a decade or more, but only if they are thoroughly dried and sealed against moisture first. Seeds frozen with residual moisture crack internally and fail to germinate. The long term storage guide on https://potentthcseeds.com covers drying with silica gel, vacuum sealing, and thawing slowly before use to avoid condensation. Done carefully, freezing is the best option for rare packs you want to preserve.