aponogeton ulvaceus is the fastest growing plant i have in my tank, grew up to inches in 10 days, i bought it without any leaves at all, only bought it as a bulb, its the nicest plant in my tank as well and it flowers. Im not doing anything special with my tank.... and it grows about a new 20" leaf everyweek. Its the only plant i need to trim to keep it from blocking the other plants light, it killed my small corkscrew valve since it grew so big. Ive cut about 20 leaves off in 2 months time.