Blue Mistflower
Eupatorium coelestinum 'Cori'
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
18 inches
Light
Full Sun, Partial Sun
Zones
5, 6, 7, 8, 9
Water
Moderate to wet
Humidity
Prefers moderate humidity
Lifespan
Perennial
Native To
Eastern and Central North America
Toxicity
Toxic if ingested
The Story
Plant Bio
Conoclinium coelestinum, commonly known as Blue Mistflower, is a rhizomatous perennial with ovate, toothed leaves and fluffy, powder-blue flowerheads that bloom in late summer and fall. The 'Cori' cultivar is a more compact selection, prized for its dense clusters of vibrant blue flowers that are highly attractive to butterflies and other late-season pollinators.
Uses & Benefits:
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds into moist soil in early spring for best germination.
- Water regularly until established, about 6 weeks.
- Provide full sun for optimal flowering.
- Fertilize with a balanced fertilizer in spring.
- Prune back after flowering to promote bushiness.
- Divide clumps every 2-3 years in early spring.
Pro Tip
Ensure well-draining soil and full sun for best growth.
Keep It Thriving
Care Guide
Do
- Water regularly during dry spells 🌱
- Prune after blooming to maintain shape
- Mulch to retain moisture
Don't
- Overwater to prevent root rot ❌
- Avoid heavy fertilization which can promote disease
- Don’t cut back in late fall
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Pinch | ||||||||||||
| 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
Blue Mistflower questions
What zones can Blue Mistflower grow in?
Blue Mistflower is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Blue Mistflower deer resistant?
Yes — Blue Mistflower is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Blue Mistflower bloom?
Blue Mistflower typically blooms in late summer to fall through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Blue Mistflower need full sun?
Blue Mistflower does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
More Eupatorium to compare
Joe Pye Weed Euphoria Ruby
Eupatorium purpureum 'Euphoria Ruby'
Spotted Joe-Pye Weed
Eupatorium maculatum
Hyssop-leaved Thoroughwort
Eupatorium hyssopifolium
Gateway Joe-Pye Weed
Eupatorium maculatum 'Gateway'
Red Dwarf Joe Pye Weed
Eupatorium maculatum 'Red Dwarf'
Joe Pye Weed
Eupatorium maculatum 'Riesenschirm'
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Blue Mistflower 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.
