Montana Blue Cornflower
Centaurea cyanus 'Montana Blue'
Essentials
At a Glance
Plant Type
Perennial
Height
36 inches
Width
24 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6
Water
Moderate, drought-tolerant once established
Humidity
Average garden humidity
Lifespan
Perennial
Native To
Europe
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
Montana Blue is characterized by its striking blue flowers and feathery foliage, making it a popular choice for gardens. This cultivar is known for its larger flowers and more robust structure compared to other cornflowers.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds about 1/4 inch deep into well-draining soil.
- Mist cuttings lightly to maintain moisture and root in 4-6 weeks.
- Plant in full sun for optimal flowering.
- Water regularly but avoid waterlogging, especially during dry spells.
- Apply a balanced fertilizer monthly during the growing season.
- Deadhead spent flowers to encourage continuous blooming.
Pro Tip
Sow seeds directly outdoors after the last frost for best natural appearance.
Keep It Thriving
Care Guide
Do
- Water during dry spells to keep soil moist 🌱
- Deadhead flowers regularly to promote new blooms
- Mulch around plants to retain moisture and suppress weeds
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t fertilize excessively, as it can lead to leggy growth
- Refrain from disturbing roots when planting or dividing
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Divide | ||||||||||||
| Prune | ||||||||||||
| Stake |
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
Montana Blue Cornflower questions
What zones can Montana Blue Cornflower grow in?
Montana Blue Cornflower is hardy in USDA Zones 4–6. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Montana Blue Cornflower deer resistant?
Not reliably. Deer may browse Montana Blue Cornflower, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Montana Blue Cornflower bloom?
Montana Blue Cornflower typically blooms in early summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Montana Blue Cornflower need full sun?
Montana Blue Cornflower does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Montana Blue Cornflower drought tolerant?
Yes — once established (usually after the first full season), Montana Blue Cornflower handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Centaurea to compare
Blue Cornflower
Centaurea cyanus 'Blue Diadem'
Amethyst in Snow Bachelor's Button
Centaurea cyanus 'Amethyst in Snow'
Cornflower Bachelor's Button
Centaurea cyanus 'Bachelor's Button'
Red Boy Cornflower
Centaurea cyanus 'Red Boy'
Amethyst Dream Cornflower
Centaurea cyanus 'Amethyst Dream'
Black Gem Cornflower
Centaurea cyanus 'Black Gem'
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Montana Blue Cornflower 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.
