I may not have understood. You are
growing it in water? Mine are doing well but I planted them in soil. I'm sure if they are trying to bloom and failing it is a lack of nutrements(sp). I would attempt to plant them in soil with the greenery above ground. Choice a potting soil like miracle-gro that has plant food already in it. Maybe you can get it to bloom that way.
If I am way off base, which is possible with me, just ignore me. I really do mean well.