Prefers a rich moist alkaline soil in full sun. Succeeds in pond margins.

None known

Seed - sow spring in a cold frame. Prick out the seedlings when they are large enough to handle and plant them out in the summer. Division in spring. Larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring.

Wet grassland, fens, river banks, ditches etc.