What are the key points for propagating herbaceous perennials?

I. Sowing

This method is used for some species that grow relatively sturdy and well and can bloom 1-2 years after the seeds are sown, but it is divided into spring sowing and autumn sowing, depending on the specific species. Those that bloom in summer and autumn and go dormant in winter can be sown in spring; if they bloom in spring and are dormant in summer, they are sown in autumn. Different species use different methods, and you can judge according to the specific variety.

II. Division

For some types that take a long time to propagate from seed, it is best not to use sowing, because the cultivation time is too long. In this case, the division method can be used, and the timing also differs somewhat; it needs to be determined according to the flowering period and cold tolerance. Those that bloom in spring and have strong cold tolerance are chosen in autumn, while those with poorer cold tolerance can be chosen in spring or autumn, such as Rohdea japonica and Acorus gramineus.

III. Cuttings

Cuttings are also a method. For example, for types such as chrysanthemums and carnations, stem segments can be cut for cuttings, and the method is relatively simple.