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You can put a stem from one plant onto the roots of another plant, and they will grow together if you use plants that are closely related to another! This process is known as grafting, and it's used to grow a lot of the fruit that we eat. One of the coolest things about grafting is that it is possible to make trees that make different fruits by grafting a few different stems onto the same roots - for example, it's possible to make a tree that makes plums, peaches and cherries. One guy even managed to make a tree that produces 40 different types of fruit!