Thompson & Morgan Allium Globemaster - KB6653
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Robert DyasThompson & Morgan Allium Globemaster Bulbs - 2 Bulbs - Lilac Purple - RHS AGM Variety
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Full details
The Thompson & Morgan Allium 'Globemaster' is an exceptional choice for gardeners looking to add architectural height and dramatic color to their borders without intensive maintenance. This hardy bulb is perfect for cottage gardens, wildlife-friendly spaces, and cut flower arrangements, providing large, 15cm spherical purple blooms that are guaranteed to flower in their first year. While it is a stunning addition to any landscape, gardeners should be aware that it produces only one bloom cycle per season, though the subsequent skeletal seedheads offer continued visual interest through autumn.
All features
| Model Part Number | KB6653 |
|---|---|
| Brand | Thompson & Morgan |
Extended Product Information
FAQs
When is the best time to plant Allium Globemaster bulbs?
These bulbs should be planted in the autumn, allowing them to establish roots before the dormant winter period.
Do I need to lift the bulbs after flowering?
No, Allium Globemaster is hardy and can be left in the ground to naturalize and return year after year.
Are these bulbs toxic to pets?
Like many alliums, they can be harmful if ingested by pets; it is recommended to keep them in areas inaccessible to curious animals.
Why do the leaves turn yellow before the flower opens?
It is characteristic of many Alliums for the lower foliage to begin wilting as the flower stalk matures. This is normal behavior.
Can I grow these in pots?
Yes, they thrive in containers as long as you use a well-draining potting compost and ensure the pot has adequate drainage holes.
How far apart should I plant the bulbs?
Plant them approximately 15cm apart to allow the bulbs enough space to develop their full potential size.
Troubleshooting
Flowers are stunted or do not reach full size
Ensure the bulbs were planted in full sun and are not being crowded by larger, overhanging shrubs.
Bulbs failing to emerge in spring
Check the soil drainage; Alliums are prone to rot in waterlogged winter soil.
Pros and Cons
Pros
- Guaranteed flowering in the first year of planting
- Large, high-impact flower heads (up to 15cm)
- Low-maintenance and easy to grow
- Attractive to bees and pollinators
- Long-lasting interest with decorative seedheads
Cons
- Flowers only once per growing season
- Requires full sun for optimal performance
- Foliage may begin to fade as the flowers reach their peak
Setup, Compatibility & Care
Allium 'Globemaster' bulbs should be planted in the autumn in fertile, well-draining soil. Ensure they are planted in a location that receives full sun to encourage the most vibrant color and strongest stems. Plant the bulbs at a depth approximately three times their own height. While these plants are hardy, they do not tolerate waterlogged soil, so add grit or horticultural sand to the planting hole if your garden soil is heavy clay. In early spring, apply a balanced granular fertilizer to support initial growth, and ensure the area is kept clear of competing weeds as the shoots emerge.