This perennial dies back to below ground level each year in autumn, then fresh new growth appears again in spring.
- Position: full sun or partial shade
- Soil: deep, fertile, well-drained soil
- Rate of growth: fast-growing
- Flowering period: May to August
- Hardiness: fully hardy
- Garden care: To minimise the risk of powdery mildew taking hold ensure that the plant is watered well during hot, dry spells. To rejuvenate and minimise congestion lift and divide large clumps in autumn or spring.