RHS 
A robust, upright bulbous perennial plant with long, basal, strap-like leaves. The flower is a dense round globe, approximately 10cm across, made up of little starry, mid to pale-purple individual blooms which are produced in late spring and early summer, with seeds that ripen by late summer
0.5-1 metres
0.1-0.5 metres
| Season | Stem | Flower | Foliage | Fruit |
|---|---|---|---|---|
| Spring | ||||
| Summer | ||||
| Autumn | ||||
| Winter |
Grow in full sun and fertile well-drained soil. It is best to grow in containers where garden soil is heavy clay and prone to saturation over winter. See allium cultivation
Propagate by seed when just ripe or in spring; or propagate by offsets which can be carefully detached by lifting the bulb after flowering has finished. See bulb propagation
No pruning required, other than to remove old flowered stems and foliage
May be susceptible to allium leaf miner and onion fly
May be susceptible to onion white rot, and onion downy mildew