By blasting them with chemicals or radiation in order to create a bunch of random mutations, in the hopes that one of those mutations are beneficial. So instead of injecting very specific target genes into a plant, which is a very controlled process, you end up with a bunch of random mutations of which you apparently aren't worried about the side effects. Those breeds are not labeled in any way and simply mixed in with everything else in your local supermarket. This whole "we're messing with nature with no idea of the repercussions" in regards to gene editing is just uneducated esoteric nonsense.