Requires a well drained soil and a sunny position. Plants are well-suited to coastal gardens and dry soils. Hardy to about -20°c.

None known

Seed - sow spring in a greenhouse. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Division in spring. Very difficult.

Coastal salt flats.