Allium 'Purple Sensation' produces iconic, rounded violet-purple flowerheads on tall, sturdy stems...Allium 'Purple Sensation' produces iconic, rounded violet-purple flowerheads on tall, sturdy stems that bloom in early summer. These popular perennial bulbs are perfect for creating striking displays in garden borders, patio pots, or cottage-style gardens. A favorite among pollinators, these Alliums are highly attractive to bees and produce excellent, long-lasting cut flowers. Once the vibrant blooms fade, the architectural seedheads remain ornamental for several months. For best results, plant these top-grade bulbs 15cm deep in well-drained, fertile soil in a sunny position. Each bulb should be spaced 10cm apart to allow for proper development. With the RHS Award of Garden Merit, this variety is a reliable choice for any gardener looking to add height and drama to their outdoor space.
Allium 'Purple Sensation' bulbs are ideal for gardeners seeking to add vertical interest and architectural drama to borders, patio containers, or cottage-style landscapes. These perennials offer iconic, violet-purple globe blooms that serve as a magnet for bees and other essential pollinators, though they require well-draining soil to prevent bulb rot during the dormant winter months.
All features
Model Part Number
1307358
Brand
Marshalls Garden
Extended Product Information
FAQs
When is the best time to plant these bulbs?
Allium 'Purple Sensation' should be planted in the autumn while the soil is still workable.
Do I need to lift them every year?
No, they are hardy perennials and can be left in the ground year-round provided the soil drainage is adequate.
Can I grow these in pots?
Yes, they thrive in containers, provided the pot has excellent drainage and is deep enough for the 15cm planting depth.
Are these bulbs deer or rabbit resistant?
Generally, Alliums are avoided by deer and rabbits due to their onion-like scent.
Should I cut the stems back after flowering?
You can remove the stem after the seedhead loses its ornamental appeal, but it is best to leave the foliage until it turns yellow so the bulb can store energy for next year.
Troubleshooting
Bulbs fail to emerge in spring
This is often caused by winter waterlogging; ensure your soil is well-drained and avoid planting in low-lying areas where water pools.
Flowers are smaller than expected
Bulbs may be overcrowded; consider lifting and dividing them every 3-4 years once the foliage has completely died back.
Pros and Cons
Pros
High visual impact with vibrant purple coloration
Loved by bees and essential garden pollinators
Very low maintenance once established
Provides multi-seasonal interest through seedheads
Excellent for cutting and floral arrangements
Cons
Requires very well-drained soil to avoid rotting
Foliage can start to yellow as the flowers emerge
Not suitable for heavy, waterlogged clay soil
Setup, Compatibility & Care
Planting Time: Best planted in autumn before the ground freezes.
Depth: Bury bulbs 15cm deep to ensure stability and proper root development.
Spacing: Keep bulbs 10cm apart; overcrowding can lead to smaller blooms in subsequent years.
Soil Conditions: Choose a spot with fertile, free-draining soil. If your soil is heavy, add a handful of horticultural grit to the base of each planting hole.
Sun Exposure: Ensure they are in a position that receives full sun.
Care: Avoid overwatering during the dormant phase. Once the foliage has died back naturally, you can tidy the area, or leave the architectural seedheads standing for winter interest.