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.
Divide clumps in autumn or spring, or propagate by seed.
Pests, diseases or disorders
Slugs and snails can damage plants.