Codonopsis nervosa

Seed - surface sow in spring to early summer in an ericaceous compost in a greenhouse. Do not allow the compost to dry out. The seed usually germinates in 1 - 6 weeks at 20°c^[2]. Prick out the seedlings into individual pots as soon as they are large enough to handle and grow them on in a greenhouse for their first winter. Plant out in late spring or early summer and protect them from slugs until the plants are well established[K]. Division in spring, with care, since the plant resents root disturbance^[3]. We have found it best to take small divisions that are teased out from the sides of the main clump so as to cause the least possible disturbance to the plants and to avoid having to dig up the clump. These small divisions need to be potted up and placed in light shade in a greenhouse until they are rooting well. They can be planted out into their permanent positions in the summer if they are large enough, otherwise in the following spring[K].

We have very little information on this species and do not know how hardy it will be in Britain, though judging by its native range it is likely to be hardy at least in the milder areas of the country. The following notes are based on the general needs of the genus.

Prefers a well-drained fertile light soil in full sun or semi shade^[4][3]. Plants only succeed in full sun if the soil remains moist during the growing season^[3]. Prefers a slightly acid soil^[2]. The plant resents root disturbance and should be planted out into its permanent position as soon as possible^[2]. Plants are very susceptible to the ravages of slugs. The young shoots in spring are particularly at risk, though older growth is also eaten[K].

It is best grown on a high bank in order to give a good view of the flowers^[4].