Allium Bulbs 'Caeruleum' - 20 Pack
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The Marshalls Garden Allium Bulbs 'Caeruleum' (20 Pack) are an ideal choice for gardeners looking to add vibrant, electric blue accents to their borders or container displays. These hardy bulbs provide striking rounded flowerheads on tall stems, offering significant pollinator benefits for bees and other insects; however, they require well-drained soil and patience as the foliage must be left to die back naturally after the blooming period ends.
All features
| Model Part Number | 1306858 |
|---|---|
| Brand | Marshalls Garden |
Extended Product Information
FAQs
When is the best time to plant Allium caeruleum?
These bulbs should be planted in the autumn, specifically between September and November.
How deep should I bury the bulbs?
Plant the bulbs at a depth of 10 to 15cm.
Can these bulbs be grown in pots?
Yes, they are an excellent choice for pots as long as the containers have good drainage holes and are placed in a sunny location.
Do I need to cut back the foliage after flowering?
No, you should allow the foliage to die back naturally. This is essential for the bulb to absorb nutrients for next year's blooms.
Will these bulbs attract bees?
Yes, Allium caeruleum is specifically noted for being a pollinator-friendly plant that attracts bees and other insects.
How tall do these plants grow?
The flowerheads appear on tall stems that reach approximately 60cm in height.
Troubleshooting
Flowers are leaning over or flopping
This often indicates insufficient sunlight. Move containers to a sunnier spot or choose a more sheltered location for border-planted bulbs.
Bulbs failing to sprout in spring
Check soil drainage. If the ground is waterlogged, the bulbs may have rotted during the winter; ensure you are using well-draining soil next season.
Pros and Cons
Pros
- Vibrant blue color creates a unique aesthetic
- Excellent for attracting bees and local pollinators
- Hardy variety suitable for containers and borders
- Provides structural height to flower arrangements
Cons
- Foliage must die back naturally, which may look messy for some gardeners
- Requires well-drained soil to prevent bulb rot
- Seasonal planting limited to autumn months
Setup, Compatibility & Care
For optimal growth, plant your bulbs between September and November. Dig a hole to a depth of 10 to 15cm, ensuring the pointed end is facing upward. Space bulbs approximately 10cm apart to allow for proper airflow and root development. They prefer soil that is moist but well-drained; if you have heavy clay soil, mix in horticultural grit or sand before planting. After the flowers fade, resist the urge to trim the leaves. Allow them to yellow and wither completely, as this allows the bulb to store energy for the next growing season.