An idle thought struck me. Let’s say you’re on the latitude of Northern Europe and you’ve become a locavore, someone who avoids foodstuffs that must be transported far from their production site. Let’s also say that you don’t like greenhouses. And finally, let’s say you’re hooked on coffee or tea. Is there a caffeine source that can be grown outdoors in Northern Europe?
Most psychoactive substances only occur in a small group of closely related plants. But caffeine pops up in widely divergent branches of the floral kingdom. Does anybody know of a caffeine-producing plant that, say, a Dane or a Canadian could grow in his back yard?