Growing a cinnamon tree (Cinnamomum zeylanicum) takes the concept of edible landscaping to a whole new level. This exotic tree, which comes from Southwest India, is the source of the spice cinnamon. The spice comes from its aromatic bark. Cinnamon trees grow outside year-round in U.S. Department of Agriculture plant hardiness zones 10 through 12. In colder regions, it grows well as a potted tree, outside in summer and inside through the winter.