They are moderately to very frost-hardy, they prefer a sunny site with well-drained soil. You can propagate annuals, biennials and perennials in the spring or early autumn from seed.
Softwood cuttings in early spring or summer the perennials, sub-shrubs and shrubs; annuals and biennials by seed in spring or early autumn.
Pests, diseases or disorders
Prone to stem rot and rot.