[The History Guy](https://youtu.be/Isq1-htLiEk) did a great 5-10 minute history of apples. Did you know there are *thousands* of apple variety? In the US, there is a legend – that turns out to be true – of a [guy named Johnny Appleseed](https://youtu.be/MKs0VJbB0R4) who planted apple trees and gave out apples for others to grow all across the US.
As the other commenters have said, some types of food plant have a lot of varieties because people specifically bred and crossbred a bunch of different kinds. People did this for a LOT of different plants too, but not all varieties of fruits are able to be grown or transported efficiently. Usually only the types of crops easiest to mass-grow become commonplace.
As another example of a lot of fruit varieties, [every single citrus fruit ever came from 3 initial species, the citron, pomelo, and mandarin.](https://www.atlasobscura.com/articles/grapefruit-history-and-drug-interactions) These have been crossbred and selectively bred into familiar fruits such as lemons, limes, oranges, and grapefruits, but there are *tons* more that aren’t commonly grown in mass quantities.
For a non fruit example, [cabbage, kale, and broccoli, as well as various other veggies,](https://www.vox.com/xpress/2014/8/6/5974989/kale-cauliflower-cabbage-broccoli-same-plant) were all bred from the same ancestor veggie.
In apples there are a variety of varieties that folks use for different things.
Just like you have white onions, yellow onions, sweet onions, green onions…. Or red peppers, orange/yellow peppers, green peppers, mini peppers, jalapeño, habanero, Serrano…. Or russet or Yukon gold, or baby red potatoes…. Or Roma tomatoes or beefsteak or cherry…..
But some produce has become particularly popular or comoditized in just a few similar variations for various reasons. Bananas for example are a clone of the variety that transports well and folks are familiar with. Carrots used to be all sorts of colors, but orange settled into popularity and the different varieties grown are all pretty similar in form and flavor – and growth so they’re good commercial variants.
Most produce there are dozens if not hundreds of varieties available, but they don’t all transport or sell well at retail. Of the thousands of apple varieties, you still only get a handful in the store.
Check out [www.rareseeds.com](https://www.rareseeds.com). Just one company selling heirloom seeds (the one I use) of many. There are dozens to thousands of varieties of many types of edible plants. Stores usually have stuck on one or two types that suit their needs regarding uniformity and shelf life.
Did you know in Brazil we have more then 3 types of banana available everywhere, and they have different uses? And in Bolivia, they have different types of corn, that are not yellow? Basically, some places prefer just one type of that fruit/vegetable, so others are not produced and sell there. But it depends were you live. I also know there is more than 1 type of rice, but in Brazil (were I live) you would need to go to a special place to find one other than the normal white rice.
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