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Allium obliquum
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  • Allium obliquum
  • Allium obliquum
  • Allium obliquum
Allium obliquum

Allium obliquum

Twisted-Leaf Onion
RHS Plants for Pollinators The RHS Plants for Pollinators mark is only given to plants that support pollinating insects. Find out more at rhs.org.uk/plantsforpollinators
ALLIUM (Liliaceae) ornamental onion

Allium offer clean vertical accents in the border, with rounded or domed flower heads held above the foliage. They are straightforward to grow in full sun and freely draining soil, and their simple, architectural shapes work easily with a wide range of perennials and grasses. As the flowers fade, many species leave dry seed heads that persist well into autumn, carrying the season quietly forward. The mild onion scent in the foliage helps deter browsing wildlife, adding to their reliability in both designed and naturalistic plantings.

A tall, slender allium with pale yellow flowers held in tight, rounded heads on firm, upright stems. Leaves are broad and twisted, giving the plant an early structural presence before the stems rise. Different forms exist in cultivation, some flowering in late spring and others in early summer, but all share the same clean, restrained character. Clumps emerge early in the season, often as early as February, and are most effective when planted in small groups. Prefers full sun and well drained soil, developing into a long-lived, steady performer.
Pot size
$8.00
Out of stock
Growing Conditions

Light: full sun

Moisture: average to dry

Soil: well drained; accepts sandy or rocky soils

Hardiness zone: 3

Maintenance: low; remove spent stems; allow foliage to decline naturally
Size & Habit

Height (cm): 80

Spread (cm): 20

Habit: upright, clump-forming perennial
Seasonal Interest

Flowering period: May–June

Seasonal interest: spring emergence; late spring to early summer bloom

Foliage: blue-green

Flower: yellow
Ecology & Notes

Wildlife value: visited by bees and other generalist pollinators

Deer/Rabbit resistance: yes

Habitat: sunny borders; gravel gardens; larger groupings; dry meadow plantings

Features: pale yellow flowers; stiff upright stems; early emergence; notable twisted foliage

Notes: subtle in appearance but effective in groups; early seasonal emergence is characteristic

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