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Saving seed from an open pollinated CBD crop and replanting it next year sounds thrifty, but the ratio will drift, usually toward more THC. High CBD lines depend on a specific gene combination that breaks apart in the second generation, so a portion of the plants come up as balanced or even THC dominant. There is a clear explanation of why this happens genetically on https://calmcbdseeds.com, written for people without a biology background. Buying fresh seed each season is annoying but it keeps you compliant.