> or that a massive number of small farms (let us say 100 times as many as exist today) each grow a huge variety of plants (let's say 10 times as many types as

> or that a massive number of small farms (let us say 100 times as many as exist today) each grow a huge variety of plants (let's say 10 times as many types as they do today). It's called a https://en.wikipedia.org/wiki/Plant_nursery https://en.wikipedia.org/wiki/Plant_nursery and many specialized in native and obscure cultivars.