Indoor Trees

Whats a good indoor, fragrant tree/plant to grow. Im thinking dwarf lemon etc any suggestions, good trees or maybe good place to buy them near fruiting age.

Khat (Catha Edulis) is a nice indoor tree to grow.

Not only is it psychoactive (containing both cathinone (in fresh leaves and shoots) and cathine) but it smells good and is technically a tree. It will shoot up in about a year and grows to be quite a few meters tall.