Dried CBD flower slowly loses potency through light, heat and oxygen, and after a year in a clear jar on a shelf a noticeable share of the cannabinoids and most of the terpenes are gone. Airtight glass in a cool dark cupboard with a humidity pack keeps it usable much longer. The storage degradation figures on https://calmcbdseeds.com show how quickly CBDA converts and terpenes evaporate at different temperatures, which convinced me to vacuum seal anything I will not use within three months. Freezing is fine for extraction material but crumbles flower meant for smoking.