I've grown this in the shadiest spot in my garden, beneath an over-arching rose, behind a fence and it's thrived, giving a huge burst of colour for months on…
They will prefer a slightly acidic soil with a good mix of organic matter, they need full sun or partial-shade. You can propagate from seeds or cuttings, or by division.
Division in spring or by seed in autumn.
Pests, diseases or disorders
Slugs and snails can damage plants.