I rubbed the flowers with the tip of one my bird's shed wing feathers every day for like a week. After doing that the flowers went from looking like this

to this.

I had accidently snapped off the flower stalk when cleaning the tank, but since the seed pods had already formed and had grown a bit, I sniped off the rest of the stalk and left the flower head with the pods attached to float in the tank, within hours the pods burst releasing one or two seeds (which floated), within half an hour most of the seed coats split and the little plantlets dropped to the bottom of the tank.

All this happened yesterday and some of the plantlets have already grown a few leaves and roots. Its shocking how quickly these plants grow, I can't immagine what my tank will look like in a week.