California

Health & Safety Code § 11362.1 (Prop 64) allows adults 21+ to possess, plant, and cultivate up to six cannabis plants and to give away cannabis — including seeds — to other adults without payment. Commercially, licensed nurseries produce seeds and immature plants, and 4 CCR § 15408 authorizes licensed retailers to sell seeds and live plants to consumers so long as they originate from a licensed nursery; unlicensed sales remain a crime under H&S § 11360. Industrial hemp cultivation requires registration with the county agricultural commissioner under Food & Agricultural Code § 81000 et seq., but hemp seed possession and sale are otherwise lawful.