Amorphophallus titanium, Titum Arum is only grown by specialists, this is the largest flowering shrub in the world - e.g. it has the largest single flower (unbranched inflorescence).
It is also the smelliest producing a disgusting stench that will make you want to throw up - which is one of the reasons why its not in common cultivation !!
Its also why it is sometimes called the 'Corpse Plant" and some say it smells like a rotting Elephant corpse.
It can take many years to bloom, then it only last 2-3 days.