Amorphophallus can rot if left in soil with too much moisture. I remove all soil from mine and let them sit/dry out all winter while they are dormant. I'm not sure what the potential for rotting is for titanum, but I do know they should be left in soil when dormant. Pretty sure they need consistent hot/balmy temperatures for proper growth/development/flowering. I have a friend in St. Louis that grows them and has excellent success blooming titanum (gets several blooms per year). She does this because she keeps them in a temp controlled greenhouse year round at high temps/humidity. Not sure what the success would be outside of this environment. I do know that she gave the Missouri Botanical Gardens a few and they haven't gotten a bloom yet.
Edit: update on konjac bloom...22 inches, not opening yet.
