We all know that old story about planting mint in a pot with no bottom, to restrict the spread of it... and it's not just mint that needs a bit of a firm hand:…
This plant can withstand poor soil, deep shade and extreme cold. If growing in a container, feed occasionally.
By seed in spring or autumn, or by division in autumn. Selected cultivars should be propagated by division only.
Pests, diseases or disorders
Usually little trouble from pests and diseases.