Exactly the same way – natural evolution. Where things get complicated is humans … *encouraging* evolution by selecting specific plants and selectively breeding them. Google for ‘Hybrid Citrus’, you`ll be surprised at what fruits humans have created.
Cross-breeding or selective breeding in this way only needs the species to be genetically close enough. You can`t cross an apple and a tomato, but a great example of where you can are dogs – they can all interbreed so it is possible to cross a bulldog with a shi-tzu and end up with a bullshit. Actually true, though they’re really called bull-tzu, which is far less fun.
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