Cinnamon Trees - eerussianguy/firmalife GitHub Wiki
Cinnamon Trees will generate rarely throughout your world in places with rainfall above 300 and temperature above 29 degrees Celsius. If you cut it down, you'll only get sticks for wood, and some saplings, so don't bother with that right away.
The Cinnamon Tree is used for it's bark. To harvest, simply right click with a knife on a log block that is not connected to leaves. It will grow back in a year, if the tree has enough leaves. Cut too many leaves off the tree, and you'll be out of luck!
Cinnamon bark needs to be dried into dried cinnamon, which can be ground up into ground cinnamon.