Mount Everest Onion
Allium gratisimum 'Mount Everest'
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Bulb Corm Tuber
Height
40 inches
Width
12 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Central Asia
Toxicity
Toxic if ingested in large quantities
The Story
Plant Bio
Giant ornamental onion with tall, sturdy stems and large white spherical flower heads. Notable for its exceptional height and striking late spring display.
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck bulbs 4–6 inches deep in well-drained soil in fall.
- Water thoroughly after planting to settle soil around bulbs.
- Mist cuttings in spring for propagation, keeping soil moist.
- Fertilize with balanced bulb fertilizer in early spring.
- Remove spent flower heads to promote bulb health.
- Mulch lightly to conserve moisture and suppress weeds.
Pro Tip
Plant in well-drained soil with full sun for best flowering results.
Keep It Thriving
Care Guide
Do
- Water during dry spells 🌱
- Mulch to retain soil moisture
- Fertilize annually in early spring
- Remove dead foliage after flowering
Don't
- Avoid overwatering to prevent bulb rot ❌
- Don’t disturb bulbs once established
- Refrain from fertilizing late in the season
- Avoid planting in heavy clay soil without amendment
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Divide | ||||||||||||
| 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
Mount Everest Onion questions
What zones can Mount Everest Onion grow in?
Mount Everest Onion 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 Mount Everest Onion deer resistant?
Yes — Mount Everest Onion is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Mount Everest Onion bloom?
Mount Everest Onion typically blooms in late spring to early summer through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Mount Everest Onion need full sun?
Mount Everest Onion does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Mount Everest Onion drought tolerant?
Yes — once established (usually after the first full season), Mount Everest Onion handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
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Keep exploring
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Hardy in your zone?
Grow Mount Everest Onion 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.
