You'll often hear this being talked about by gardeners, especially at this time of year: but what is it, and why do we do it? There are various theories about…
Although the roots have the highest concentration of dangerous alkaloids, all parts of the plant are poisonous, so it is wise to wear gloves when handling.
By division in autumn.
Pests, diseases or disorders
Fungal stem rot, Verticillium wilt and aphids may be a problem.