Globemaster Allium
Allium giganteum 'Globemaster'
Essentials
At a Glance
Plant Type
Bulb Corm Tuber
Height
36 inches
Width
24 inches
Light
Full Sun
Zones
4, 5, 6, 7, 8
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Central Asia
Toxicity
Toxic to dogs and cats
The Story
Plant Bio
Large, spherical clusters of blue flowers atop tall stems. Known for its impressive height and dramatic floral display, Globemaster is a favorite for ornamental gardens.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck large bulbs 4-6 inches deep in well-draining soil in early fall.
- Water thoroughly after planting to settle the soil around the bulbs.
- Mist the foliage regularly during the growing season for lush growth.
- Support tall stems with stakes if needed to prevent toppling.
- Fertilize with a balanced bulb fertilizer in early spring for optimal growth.
- Divide overgrown clumps every 3-4 years in late summer for rejuvenation.
Pro Tip
Plant in a sunny spot with well-draining soil to prevent bulb rot and ensure healthy blooms.
Keep It Thriving
Care Guide
Do
- Water deeply during dry spells 🌱
- Provide full sun exposure for best flowering
- Apply balanced fertilizer in early spring
- Support tall stems with stakes if needed
- Mulch to retain moisture and suppress weeds
Don't
- Avoid overwatering to prevent bulb rot ❌
- Do not plant in heavy clay soil without amendment
- Avoid disturbing bulbs during flowering
- Do not neglect staking tall flower stems
- Avoid fertilizing late in the season
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Plant | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Globemaster Allium questions
What zones can Globemaster Allium grow in?
Globemaster Allium is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Globemaster Allium deer resistant?
Yes — Globemaster Allium is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Globemaster Allium bloom?
Globemaster Allium typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Globemaster Allium need full sun?
Globemaster Allium does best in full sun (6+ hours).
Is Globemaster Allium drought tolerant?
Yes — once established (usually after the first full season), Globemaster Allium handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Allium to compare
Millennium Gold Onion Moly Onion
Allium x moly 'Millenium'
Drumstick Allium, Round-headed Leek
Allium sphaerocephalon
Purple Sensation Allium
Allium hollandicum 'Purple Sensation'
Ornamental Onion 'Ambassador'
Allium cybum 'Ambassador'
Blue Eddy Allium
Allium senescens 'Blue Eddy'
Millennium Ornamental Onion
Allium millenium
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Globemaster Allium with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
