I'm currently growing Cinnamomum Aromaticum. The cultivar would be Tung Hing...if you can even call it a cultivar. It is a Cassia, not zylenicum though. The cinnamon used in the US is always Cassia. Cinnamon used in the UK and Mexico is Zylenicum, or "true cinnamon." I prefer the stronger oil concentration in Cassia, and some of the best cinnamon in the world (Saigon Cinnamon) is Cassia. Cassia has a spicier/hotter flavor, while Zylenicum has a milder and slightly citrus flavor.

The tree is very vigorous, and it suckers easily. Scales seem to love it, so be vigilant about them. Otherwise, it's one of the easiest things I grow. The bright green, glossy bark is quite interesting, and the smell of the broken leaves/stems/bark is wonderful.

I have an allspice tree, which has a cinnamon-like scent too. Seems to be an easy grower as well.