An easily grown plant, succeeding in most well drained fertile soils in a sunny position. The long tap root is susceptible to rot in wet winters.

Root. No more details are given.

Seed - sow spring in a cold frame. Germination usually takes place within 3 - 6 weeks at 13°c. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. The seed can also be sown in situ as soon as the soil is workable in the spring. Division in spring, with care.

Limestone screes and crevices.