Maintain consistently high water levels, ensuring the rhizome remains submerged by at least 30-50 cm of water. The water should be clean and free of debris. For container-grown plants, a large pond or pool is ideal.

Avoid letting the water level drop significantly, as this can stress the plant.

Remove yellowing or dead leaves and spent flower stalks regularly to maintain plant health and appearance. Cut these at the base, close to the rhizome. Pruning encourages new growth and flowering.

In very large ponds, you may need to trim excessively spreading leaves to manage space.

Propagate primarily by dividing the rhizome in spring. Ensure each division has at least one strong growing point and some roots. Cuttings can also be taken from the rhizome.

Sow seeds from fresh seed pods in warm water, though this is a slower method for this species.

Repot in early spring before new growth begins. Use a large, sturdy container (at least 60 cm in diameter) with a depth of about 30-40 cm. Fill with a heavy loam or aquatic soil mix.

Plant the rhizome horizontally, with the growing tip slightly exposed, and ensure adequate soil depth.