The Story
Plant Bio
Eryngium giganteum, also known as the 'Miss Willmott's Ghost', is a perennial plant notable for its striking blue thistle-like flowers that bloom in late summer and are excellent for dried arrangements.
This species is unique for its silvery foliage and striking flower heads which attract various pollinators while being resistant to deer and drought.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
36 inches
Width
24 inches
Light
Full Sun, Partial Sun
Zones
5, 6, 7, 8
Water
Low
Humidity
Low
Lifespan
Perennial
Native To
Mediterranean region
Toxicity
Non-toxic to humans and pets
Bloom period
Late summer – Early fall
In flower about 2 months of the year
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Choose a sunny location with well-draining soil for planting.
- Tuck seeds about 1/4 inch deep into soil in early spring.
- Water gently but consistently to keep soil moist during germination.
- Mist cuttings if propagating via division in early spring or fall.
- Thin seedlings to allow 18-24 inches of space for mature growth.
- Mulch around plants to retain moisture and suppress weeds.
Pro Tip
Avoid overwatering; ensure excellent drainage to prevent root rot.
Keep It Thriving
Care Guide
Do
- Water regularly during dry spells 🌱
- Apply a balanced fertilizer in spring
- Prune dead or damaged stems after flowering
- Mulch to conserve moisture and suppress weeds
Don't
- Don't waterlog the soil ❌
- Avoid heavy fertilization late in the season
- Don't disturb plants during flowering
- Refrain from over-planting too close together
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Propagate | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Multiply
Propagation Methods
Good to Know
Common Questions
Miss Willmott's Ghost Giant Sea Holly questions
What zones can Miss Willmott's Ghost Giant Sea Holly grow in?
Miss Willmott's Ghost Giant Sea Holly is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Miss Willmott's Ghost Giant Sea Holly deer resistant?
Yes — Miss Willmott's Ghost Giant Sea Holly is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Miss Willmott's Ghost Giant Sea Holly bloom?
Miss Willmott's Ghost Giant Sea Holly typically blooms in late summer through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Miss Willmott's Ghost Giant Sea Holly need full sun?
Miss Willmott's Ghost Giant Sea Holly does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Miss Willmott's Ghost Giant Sea Holly drought tolerant?
Yes — once established (usually after the first full season), Miss Willmott's Ghost Giant Sea Holly handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Eryngium to compare
Sea Holly
Eryngium elevatum
rattlesnake master
Eryngium yuccifolium
Big Blue Sea Holly
Eryngium x hybrida 'Big Blue'
Blue Glitter Sea Holly
Eryngium planum 'Blue Glitter'
Blue Hobbit Eryngium
Eryngium x zabelii 'Blue Hobbit'
Picos Blue Sea Holly
Eryngium bourgatii 'Picos Blue'
Keep exploring
Explore the genus
Hardy in your zone?
Grow Miss Willmott's Ghost Giant Sea Holly 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.