Allium Purple Sensation is a stunning ornamental onion that creates spectacular garden displays with its vibrant purple-violet flower heads. This reliable perennial bulb produces impressive spherical blooms that add dramatic height and colour to borders, making it a favourite amongst gardeners seeking both beauty and ease of cultivation.
Botanical Name: Allium hollandicum 'Purple Sensation'
Common Names: Ornamental Onion, Purple Sensation Allium
Flower Colour: Rich purple-violet
Bloom Time: Late spring to early summer (May-June)
Height: 80-100cm (32-40 inches)
Spread: 15-20cm (6-8 inches)
Hardiness: RHS H6 (hardy to -20°C)
The Purple Sensation produces magnificent globe-shaped flower heads measuring 8-10cm (3-4 inches) across. Each sphere contains hundreds of tiny star-shaped florets in a rich purple-violet hue that creates an almost metallic sheen in sunlight. The flowers are held proudly atop sturdy, straight stems well above the foliage, making them excellent for cutting and creating striking focal points in the garden.
Soil Requirements: Well-draining soil is essential. Purple Sensation thrives in most soil types including clay, loam, and sandy soils, provided drainage is adequate. Slightly alkaline to neutral pH (6.5-7.5) is preferred, though it tolerates a range of conditions.
Light Requirements: Full sun to partial shade. Best flowering occurs with at least 6 hours of direct sunlight daily.
Water Requirements: Moderate watering during growing season. Allow soil to dry between waterings and avoid waterlogged conditions, particularly during dormancy.
When to Plant: Autumn (September-November) for spring flowering
Planting Depth: 15-20cm (6-8 inches) deep
Spacing: 15-20cm (6-8 inches) apart
Bulb Size: Typically 14/16cm circumference
Plant bulbs pointed end upwards in well-prepared soil. In heavy clay soils, add grit or sharp sand to improve drainage. Mulch lightly after planting to suppress weeds and retain moisture.
Purple Sensation is remarkably low-maintenance once established. Water regularly during spring growth but reduce watering after flowering. Allow foliage to die back naturally to feed the bulb for next year's display. Deadhead spent flowers unless you wish to collect seeds or enjoy the architectural seed heads.
Apply a balanced fertiliser in early spring as shoots emerge. In colder regions, apply a protective mulch in winter, though this is generally unnecessary in most UK gardens.
Border Planting: Creates stunning mid-border displays, particularly effective when planted in groups of 5-15 bulbs
Cutting Garden: Excellent cut flowers with good vase life (5-7 days)
Naturalising: Suitable for wildflower meadows and naturalised plantings
Container Growing: Effective in large containers and pots
Companion Planting: Pairs beautifully with roses, peonies, catmint, and ornamental grasses
Spring: Fresh green shoots emerge in early spring
Late Spring/Early Summer: Spectacular purple flower display
Summer: Attractive seed heads provide continued interest
Autumn/Winter: Bulbs rest underground, preparing for next year's show
Purple Sensation flowers are magnets for beneficial insects including bees, butterflies, and hoverflies. The nectar-rich blooms provide valuable food sources during late spring when many other flowers have finished. Birds often enjoy the seeds from spent flower heads if left uncut.
Bulb Grade: Premium quality bulbs, size 14/16cm circumference
Quantity: Available in packs of 10, 25, or 50 bulbs
Guarantee: Healthy flowering guaranteed in first season when planted according to instructions
Storage: Store in cool, dry conditions until planting time
For maximum impact, plant Purple Sensation in odd-numbered groups rather than single specimens. The bulbs multiply naturally over time, creating increasingly impressive displays. Consider planting different varieties of alliums with staggered flowering times to extend the season of interest in your garden.
Buying Bulbs from Jacksons Nurseries
Bulbs are supplied either in pre-packaged retail packs or in some cases they are loosly picked and sent bagged.
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