Here's why:

* They're part of the "stone fruit" family: Cherries are drupes, which are fruits that have a fleshy outer part and a hard inner pit containing the seed (like peaches, plums, and apricots). Drupes typically grow on trees.

* Evolution and adaptation: Over millions of years, cherry trees have evolved to produce fruits (cherries) to attract animals. The animals eat the cherries, spread the seeds, and help the cherry trees reproduce. This is a classic example of co-evolution!

So, cherries grow on trees because it's their natural way of growing and reproducing.