Hi. I grow crypt in my fishtank, submerged 24/7, and it just keeps growing. Im not sure it flowers, but ive never seen a crypt flower in the 7 years ive been growing it. If it does flower, maybe it flowers in the manor where the flowers are just little green things at tha base of the plant, and release pollen into the water.
Just a wild stab in the dark.lol