Great information as usual Sway. I've never tried growing a large plant in a 3 gal. pot. I see guy-wires in my future.
One thing I've read in few places is that Thai Giant doesn't form much of a tuber. From my own observations I'd say the tubers actually get quite large, possibly massive. Here's a photo of the largest from May 2013.
This past winter one tuber still had the old tuber attached and so made the typical Colocasia tuber hour glass. Unfortunately I didn't snap a pic.
