Details
 
Allium giganteum is a perennial with spreading, glossy, strap-shaped basal leaves which die down before the flowers. Dense globose umbels of bright purple flowers are borne on tall stems in summer
 
Hardiness
H5 - Hardy in most places throughout the UK even in severe winters (-15 to -10)
 
Aspect
South-facing, North-facing, West-facing or East-facing
 
Exposure
Sheltered
 
Moisture
Well-drained, Moist but well-drained soil
 
Soil
Chalk, Clay, Sand, Loam
 
pH
Acid, Alkaline or Neutral
 
Size
Ultimate height
 0.5 ? 1.5 metres
Ultimate spread
 0.1- 0.5 metres
Time to Ultimate size
About 2 ? 5 Years
 
How to grow
Cultivation
Easy to grow in fertile well-drained soil. Add grit when grown in clay soils to improve drainage
 
Propagation
Propagate from seed, sowing in containers in a cold frame when just ripe or in the spring. Alternatively, remove offsets in autumn
 
Suggested planting locations and garden types
Flower borders and beds Cut Flowers Cottage & Informal Garden Gravel Garden Rock Garden
 
How to care
Pruning
No pruning required
 
Pests
Generally pest free
 
Diseases
Generally trouble-free: Onion white rot and a downy mildew may occur