Upon noticing this plant flowering in submersed conditions, I begun taking weekly photo’s and watched the spathe daily to record it’s growth. Roughly speaking; the plant grew 0.75 inches a day (3/4 inch) on the slowest day, and 1.5 inches on it’s fastest day.
Since the plant is in an aquarium that is 22 inches tall, I didn’t imagine the spathe would be able to reach the surface since I’ve never seen another spathe this large throughout my research; however upon doing my daily check up on the aquarium yesterday, I noticed the spathe finally reached the surface. The only downfall is I also noticed the spathe was beginning to partially melt where it had broken the surface, so I decided to immediately cut it down to document the spathe and take some closer pictures.
After measuring the spathe it came in at a whopping 17+ inches !! to understand the sheer scale of the spathe, I took a video with the spathe against my arm, in which it reached from my elbow to wrist; I will post the video in a few days once edited.
Enjoy the pictures below!