About
Allium 'Haarlem Superglobe' is a hybrid perennial characterized by its bulbous structure and compact, rounded clusters of star-like blooms. These flowers can be found in shades of pink, purple, or white and rise on sturdy stems that reach up to 70 cm in height during May and June. The leaves are mid-green and tend to wither and brown as the flowering phase commences. To enhance the overall appearance, position these bulbs near other plants that can mask the fading foliage. Additionally, the flowers are highly attractive to bees and various pollinators, making this variety a valuable choice for gardens focused on supporting wildlife.
About the genus
Allium consists of bulbous herbaceous perennials characterized by a pronounced onion or garlic aroma. They feature linear, strap-like, or cylindrical leaves that arise from the base. The flowers, which can be star-shaped or bell-shaped, are arranged in an umbel atop a stem that lacks leaves.
Growing conditions
- Sunlight
- Full sun
- Soil type
- Chalk, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained, Well-drained
- Aspect
- South-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H5
Plant details
- Plant type
- Bulbs
- Habit
- Clump forming
- Foliage
- Deciduous
- Height
- 0.5-1 metres
- Spread
- 0.1-0.5 metres
- Time to full height
- 1-2 years
- Suggested uses
- Cottage and informal garden, Patio and container plants, Wildlife gardens, City and courtyard gardens
- Fragrance
- Foliage
Care notes
- Cultivation
- Easy to grow in full sun and a 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
- Pruning
- No pruning required, other than to remove old flowered stems and foliage
- Propagation
- Propagate by offsets to obtain plants the same as the mother bulb, which can be carefully detached by lifting the bulb after flowering has finished. See bulb propagation. Propagation by seed may not produce plants that are true, as this is a hybrid plant
- Pest resistance
- May be susceptible to slugs, snails and allium leaf miner
- Disease resistance
- May be susceptible to onion white rot, and onion downy mildew