- Position: full sun
- Soil: fertile, moist, well-drained soil (or John Innes no. 3 compost for containers)
- Rate of growth: average
- Flowering period: July to September
- Hardiness: frost hardy (may need protection in winter)
Tall, vigorous and strikingly architectural, this clump-forming perennial produces massive flowerheads, up to 30cm across, of dark-veined, powder blue flowers from mid summer. These form above the strap-shaped, glossy green leaves on top of sturdy, upright stems and can last for several weeks before they start to fade. A taller variety that makes a big impact when planted in bold swathes, or potted up into substantial pots.
- Garden care: Apply a balanced liquid fertiliser throughout the growing season. Keep reasonably dry during the winter and protect the crowns with a dry mulch in the autumn. Divide plants that have become too big in spring, but remember you will often get more flowers when the roots are constricted.
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