Why did God make all plants, but only some animals, kosher? Sources, please.
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The famous saying "you are what you eat" may explain this. Plants do not tend to have any unruly behavior. However there are many animals that kill other animals and behave - in lack for a better term - animalistic. Hashem does not want us to eat from these animals, in order that it should not make us behave in the way they behave.
There are actually many laws that apply to plants, too, to make them "kosher", but they are all connected with/ apply in the Land of Israel. What makes a plant "kosher" is not the specific species of plant (which is what determines the kashrut of something from the animal kingdom), but how and where it was grown, and the laws that apply to it once you want to use it. All of these laws fully apply in the Land of Israel when there is a Temple standing. Some apply (sometimes in a more limited way) at all times in the Land of Israel. And a few (like orlah, challa, chadash according to some opinions) apply outside Israel too. (Some are rabbinic rather than Torah law today.)