Allium ostrowskianum 'Zwanenburg'
Bulbous perennial to 20cm tall, with twisted, strap-shaped mid-green leaves and large spherical heads of bell-shaped, deep carmine-pink flowers 10mm in length in early summer
0.1-0.5 metres
0-0.1 metre
| 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 divison or 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 downy mildews