Buy blue allium bulbs (syn. Allium azureum) Allium caeruleum

Allium caeruleum

Position: full sun
Soil: fertile, well-drained soil
Rate of growth: average
Flowering period: June to July
Hardiness: fully hardy
Allium bulb size: 4/-

This stunning blue ornamental onion is ideal for a sunny border. Dense globes of small, star-shaped, bright blue summer flowers on stiff stems and narrow, mid-green leaves. Since the leaves die back before the flowers emerge it’s best planted with other medium-sized herbaceous plants, such as sea holly, which help to mask the faded foliage.
Garden care: Plant 8cm (3in) deep in naturalistic drifts in September or October in a well-drained, sunny site. Split and divide large clumps in autumn or spring.