Water lily 'Tetragona' whiteA blooming pond. That's what we get with the water lily 'Tetragona' (Nymphaea). White and profusely blooming. We want more! The star shaped flowers also keep our pond water clear. Plant this perennial water lily in the spring. The flowers bloom in the summer. The aquatic plant is very easy to care for. We maintain a minimum planting depth of 30 cm. Just remove the older leaves in the autumn. Put the lily in a sunny spot.