Allium 'Dallas' (Ornamental Onion) – Purple Late Spring Flowering Allium (Bag of 25 Bulbs)

Allium 'Dallas' is a striking ornamental onion with large, perfectly rounded flowerheads in a rich, deep purple-violet. A reliable choice for borders and cottage-style gardens, it is loved by gardeners and pollinators alike.

You receive 25 dry bulbs in a bag, ready to plant. They are not growing plants.

The photos show the flowers in bloom.

Allium 'Dallas' gives a spectacular late spring display, with tall, sturdy stems topped with dense, globe-shaped flowerheads that hold their form long into the season. The stems are strong and need no staking. The dried seedheads add ornamental interest well after flowering, and the flowers are excellent for cutting and for dried arrangements. Bees and other pollinators visit them readily.

This ornamental onion is fully hardy in the UK and is left in the ground all year, but it needs a sunny spot with well-drained soil, as the bulbs rot if the ground stays wet through winter. Plant in bold groups of 10 or more for the most impact. Bulbs also grow well in large containers with good drainage. Let the strap-like foliage die back naturally to feed the bulb, and interplant with grasses or hardy geraniums to hide the fading leaves.

Bulbs are harmful if eaten. Keep away from children and pets.

Cultural Information

• Common Name: Ornamental Onion, Allium 'Dallas'
• Botanical Name: Allium spp.
• Fully Grown Height and Spread: Approx. 60-90cm tall and 10-15cm wide
• Growth Habit: Upright, clump-forming, with spherical flowerheads on tall stems
• Perfect For: Borders, cottage gardens, cut flower gardens, containers
• Foliage: Strap-like, grey-green leaves at the base, dying back as flowering begins
• Flower Colour: Deep purple-violet
• Planting Time: Autumn (September to November)
• Flowering Time: Spring (February to May)
• Planting Depth: Approximately 10-15cm deep
• Planting Position: Full sun to partial shade
• Soil Type: Well-drained, moderately fertile soil
• Hardiness: Fully hardy in the UK
• Type: Ornamental onion bulb