Selling marijuana seeds in California

check your licence

and consider alternatives such as money for old rope

If there is a separate license for sellers, it would probably be illegal. Anyway, the feds have a knack for extending the interstate commerce clause to cover about anything they want. I think this is an opportunity worth passing up.

A further thought; is your use legal, or decriminalized. There could be an important difference if you are engaged in trade.

The USA is about to jail a canuck for doing this very thing. I'd give it a miss.