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Allium Nigrum

Allium Nigrum

Common name White Ornamental Onion
Latin name Allium nigrum
Quantity per bag 5 bulbs
White ornamental onion produces beautiful creamy-white flower clusters with subtle green tones and dark centres. Its elegant silhouette enhances perennial beds and naturalistic gardens.

It brightens gardens with its refined flowering while adding structure and lightness to plantings. Its hardiness and ease of cultivation make it an excellent bulbous perennial.

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Product information
Bulb
identification
Common nameWhite Ornamental Onion
Latin nameAllium nigrum
FamilyAmaryllidaceae
CyclePerennial
Bulb typeBulb
Quantity per pack5 bulbs
Product
description

White Ornamental Onion (Allium nigrum) stands out with its large rounded flower clusters composed of creamy white blooms with a subtle green tint and refined dark centres. Carried on sturdy stems reaching 60 to 80 cm in height, its flowers appear from May to June, bringing brightness, structure, and lightness to garden displays. Its blue-green foliage elegantly accompanies the flower stems before naturally turning yellow after blooming. Hardy to Zone 4, this bulbous perennial performs exceptionally well in Quebec gardens and offers understated elegance that blends beautifully with late-spring plantings.

Plant the bulbs in fall at a depth of 10 to 15 cm, spacing them 15 to 20 cm apart. This allium prefers full sun and light, rich, perfectly drained soil with a neutral to slightly alkaline pH. Water lightly after planting, then moderately during active growth, allowing the soil to dry between waterings. Once established, it tolerates dry periods well. A light application of compost in spring is generally sufficient. After flowering, allow the foliage to turn completely yellow before cutting it back so the bulb can replenish its reserves.

Ideal for perennial beds, borders, naturalistic gardens, and contemporary landscapes, this allium pairs beautifully with peonies, sage, catmint, irises, and ornamental grasses. Its pale flowers also create striking contrast with purple alliums and richly coloured perennials. Rich in nectar, the flower clusters attract bees, butterflies, and many other beneficial insects, helping support garden biodiversity. They are also excellent for fresh or dried bouquets and remain decorative long after flowering.

Main
benefit
Its large creamy-white flower clusters with dark centres bring elegance and brightness to flower beds while attracting pollinators. They also make outstanding cut flowers.
Garden
placement
Where to plant Perfect for perennial beds, naturalistic gardens, borders, and contemporary plantings. Its creamy-white flowers create striking contrast with purple alliums and colourful perennials. Pair it with peonies, sage, and ornamental grasses to create elegant displays. The dried flowers remain decorative for several months.
Care level Easy
Planting
and care
ExposureFull sun
Planting periodFall
Planting depth10 to 15 cm (4 to 6 in)
Rooting temperature15 to 18°C (59 to 64°F)
Hardiness zoneZone 4
WateringWater moderately during active growth, then allow the soil to dry slightly between waterings. Once established, it tolerates dry periods well.
Soil typeRich, light, and perfectly drained soil. Avoid heavy or wet soils.
Soil pHNeutral to slightly alkaline
FertilizationA light application of compost in spring is generally sufficient. Avoid excessive fertilization, which encourages foliage growth rather than flowers.
Container
growing
Container growing is easy in a pot at least 30 cm (12 in) deep with excellent drainage. Use a light potting mix enriched with compost and amended with sand to prevent excess moisture. Place the container in full sun to encourage abundant flowering. Water moderately during active growth, then allow the growing medium to dry during dormancy. Containers may remain outdoors if drainage is excellent.
Seasonal
care
Leave the flowers to dry on the plant to extend their ornamental interest or harvest them for dried bouquets. Wait until the foliage has dried completely before cutting it back. Water only during extended periods of drought. Avoid overly wet soil during winter.
Bloom,
harvest
and garden
Bloom periodLarge creamy-white flower clusters with a subtle green tint appear in late spring and attract numerous pollinators. They are outstanding in fresh or dried bouquets.
Flower colorCreamy white with dark centres
HarvestNone
Companion plantsPeonies, sage, catmint, ornamental grasses, and irises make excellent companion plants. They beautifully highlight its elegant pale blooms.
Plants to avoidThe main problems are poorly drained soils that encourage bulb rot and slugs that may damage young shoots. Good air circulation helps reduce disease.
Wildlife appealBees and pollinators
Size
and growth
Height60 to 80 cm (24 to 32 in)
Spread15 to 20 cm (6 to 8 in)
Growth rateModerate
Rooting / establishment21 to 35 days
Frequently asked questions
The availability of our bulbs, cloves, tubers, rhizomes, seeds and plants varies depending on arrivals, seasons, nursery production and supplier availability. Some varieties may only be available for a limited time, depending on their natural cycle, planting period or available stock. These product pages are designed to guide and inspire your plant choices for the garden, vegetable garden, landscaping, container growing or sustainable outdoor projects.

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