Highlights

Architectural Blooms – Large violet-purple globes up to 8cm across create dramatic late-spring displays.
Long-Lasting Interest – Flowers in early summer, followed by striking seedheads for autumn appeal.
Easy to Grow – Thrives in well-drained soil and full sun, undemanding and reliable in most UK gardens.
Impressive Height – Reaches up to 90cm tall, adding vertical structure to borders and beds.
Perfect for Borders & Cutting – Adds colour, height, and texture to mixed borders or floral arrangements.

We're offering you a 60 or 90 Allium Purple Sensation Bulbs for £8.99, saving you up to 55% off Thompson and Morgan's's price of £19.99 (correct as of 21.10.2025).

late-spring garden alliums

Transform your garden with Allium 'Purple Sensation' – a show-stopping perennial bulb renowned for its bold, spherical blooms and RHS Award of Garden Merit status.

Botanical Profile: Allium 'Purple Sensation' is a hardy perennial from the onion family, producing striking violet-purple flower globes up to 8cm (3") across. These star-shaped flowers rise above slender stems, creating a dramatic architectural effect in late spring to early summer.
Garden Impact: Ideal for adding height, colour, and texture to mixed borders, cottage gardens, and contemporary planting schemes. The seedheads persist into autumn, offering extended visual interest and structure.
Pollinator Friendly: Attracts bees and butterflies, supporting garden biodiversity.

How to Grow Allium 'Purple Sensation'

Planting Time: Plant bulbs in autumn (September to November) for blooms the following late spring (May–June).
Sun & Soil: Prefers full sun and well-drained soil. Tolerates a range of soil types, but avoid waterlogged sites.
Spacing: Space bulbs 10–15cm apart and 10cm deep for best results.
Care Tips: Minimal maintenance required. Allow foliage to die back naturally after flowering to feed the bulb for next year. Deadhead spent blooms or leave seedheads for autumn interest.
Hardiness: Fully hardy in UK gardens (USDA zones 4–8).

Design & Companion Planting Ideas

Combine with ornamental grasses, Nepeta, Salvia, or hardy geraniums for layered borders.
Excellent for cutting – enjoy fresh or dried in arrangements.
Mix with other spring bulbs like tulips and narcissus for a succession of colour.

FAQs

When is the best time to plant Allium bulbs?
Plant in autumn (September to November) for flowers the following late spring.
How tall do Allium 'Purple Sensation' grow?
Each stem reaches up to 90cm (36") tall with a spread of about 10cm (4").
Do Alliums need special care?
Alliums are low-maintenance. Ensure well-drained soil and full sun, and allow foliage to die back after flowering for best results.