Seeing as how it's a medicine and all, many medical marijuana users prefer — and indeed, request — that their smokeable flowers are organic. And seeing as how this is Northern California and all — the GMO-hating, Alice Waters-loving capital of slow food nation — most local cannabis growers comply, producing pot free from pesticides and herbicides that burns to a fine gray-white ash (if your pot burns to black, that means there's chemicals in it, according to many a connoisseur).
But is it organic? Yes and no. Just like your table tennis set isn't Ping Pong, for the same reasons and ultimately the same effect.