Essentials
At a Glance
Plant Type
Bulb Corm Tuber
Height
12 inches
Width
8 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8
Water
Dry to medium
Humidity
Average
Lifespan
Perennial
Native To
Asia
Toxicity
Toxic if ingested in large quantities
The Story
Plant Bio
A late-season, clump-forming ornamental onion featuring slender, grass-like, gray-green foliage and small, bell-shaped, lilac-purple flowers in dense, rounded umbels. Valued for its late summer to autumn bloom time, providing color when many other perennials are fading. Its compact size makes it ideal for rock gardens and container plantings.
Uses & Benefits:
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds or bulbs into well-draining soil in fall for spring emergence.
- Water regularly to keep soil moist but not waterlogged.
- Fertilize with a balanced fertilizer in early spring.
- Mulch around the base to retain moisture and suppress weeds.
- Monitor for pests and diseases, and treat promptly if needed.
- Divide clumps every 3-4 years in early spring or fall.
Pro Tip
Plant bulbs at a depth three times their size for optimal growth and flowering.
Keep It Thriving
Care Guide
Do
- Water consistently during active growth 🌱
- Apply balanced fertilizer in early spring
- Mulch to conserve moisture and regulate soil temperature
- Divide overcrowded clumps in early spring or fall
- Deadhead spent flowers to promote new growth
Don't
- Avoid overwatering to prevent bulb rot ❌
- Don’t plant in heavy, poorly-draining soil
- Refrain from disturbing bulbs during flowering
- Avoid excessive fertilization which may cause lush foliage but fewer flowers
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
Kii Onion questions
What zones can Kii Onion grow in?
Kii 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 Kii Onion deer resistant?
Yes — Kii Onion is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Kii Onion bloom?
Kii Onion typically blooms in late summer to autumn through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Kii Onion need full sun?
Kii Onion does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Kii Onion drought tolerant?
Yes — once established (usually after the first full season), Kii Onion handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Allium to compare
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Allium sphaerocephalon
Purple Sensation Allium
Allium hollandicum 'Purple Sensation'
Ornamental Onion 'Ambassador'
Allium cybum 'Ambassador'
Globemaster Allium
Allium giganteum 'Globemaster'
Blue Eddy Allium
Allium senescens 'Blue Eddy'
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Kii 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.
