Propagation
Sow fresh seeds in wet mud and keep warm.  
Division of the daughter plants from the stolen.

Botanic information
Leaf: The leathery textured leaves are ovate to orbicular with a swollen bladder-like petiole that is up to 250 mm (9¾ in) long and enables the plant to float. 

Flower: The expanded funnelform flowers have 6-petals that are pale blue to violet with a conspicuous yellow blotch on the inner 3-petals. They are arranged in a 150mm (6in) long spike that is held above the foliage on thickish scape during summer. On maturity the spike turns downwards into the water for seed dispersal.

Fruit: The dehiscent capsule contains up to 300 seeds that are dispersed by water and are viable but the plant may be reproduced vegetatively.