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…
All parts of this plant are poisonous, so it's advisable to wear gloves. It may need staking.
You can divide every third year in the autumn or late winter. Otherwise, propagate by seed.
Pests, diseases or disorders
What out for aphids and fungal stem rot.