Blue Mistflower
Ageratum corymbosum
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
30 inches
Light
Full Sun, Partial Sun
Zones
5, 6, 7, 8, 9
Water
Medium to wet
Humidity
Moderate
Lifespan
Perennial
Native To
Central and Southeastern United States
Toxicity
All parts are poisonous if ingested.
The Story
Plant Bio
A rhizomatous, spreading perennial, valued for its masses of fluffy, powder-blue to violet, ageratum-like flowers that bloom in late summer and fall. It forms dense colonies, making it an excellent groundcover in moist areas. A magnet for butterflies, particularly in late season. It is deer and rabbit resistant and spreads vigorously by rhizomes, making it suitable for naturalizing in meadows or wild gardens.
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds into moist soil in early spring for best germination.
- Mist cuttings regularly to maintain humidity and promote root growth.
- Transplant seedlings once they are strong enough and after the last frost.
- Water consistently to keep soil evenly moist, especially during dry spells.
- Fertilize monthly with a balanced, water-soluble fertilizer during the growing season.
- Pinch back early growth to encourage bushier plants and more blooms.
Pro Tip
Use well-draining soil and avoid overhead watering to prevent fungal diseases.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil moist but not waterlogged 🌱
- Pinch back stems to encourage bushier growth
- Apply mulch to retain soil moisture and suppress weeds
- Fertilize monthly during the active growing season
- Deadhead spent flowers for prolonged blooming
Don't
- Overwater, which can cause root rot ❌
- Allow soil to dry out completely between watering
- Neglect pruning, which can lead to legginess
- Use heavy, clay soil without amendments
- Plant in shaded areas where it won't receive enough sunlight
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Mulch | ||||||||||||
| 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
Blue Mistflower questions
What zones can Blue Mistflower grow in?
Blue Mistflower is hardy in USDA Zones 5–10. 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 early fall. 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.
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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.
