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…
May need staking. Always wear gloves when handling this plant, as poison can easily pass through the skin.
By seed or by division of mature plants every three years.
Pests, diseases or disorders
Fungal stem rot, Verticillium wilt and aphids may be a problem.