Used in the treatment of phthisis (pulmonary tuberculosis),
asthma and chronic coughs.
A plant of shallow water or boggy land, it requires a fertile soil in a warm sunny position.
Seed - sow spring in a greenhouse at a temperature between 15 - 20°c. Immerse the pot so that it is 2 - 5cm below water level. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in containers of water in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer. Division in spring. Softwood cuttings in a frame in spring.