How do I fit multiple food crop species into close proximity?
In the setting I'm building now, then there's supposed to be a location where the natives had found three food staple crops within close proximity with one another, near a handful of rivers. Naturally, these natives would found one of the biggest economies in the world, and their lands would be very tactically advantageous to have, but I'm wondering how they could find so many crop species in such a small area.
I'm wanting them to be in one of the temperate bands of their planet, and in a location whererivers and the sea are readily accessible, and that there would be some nearby mountains, so it's possible one of those mountains is a volcano that produces lots of ashes?
To summarize, with these conditions, how would there be three different species of food staple crops?
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