Also known as Cornflower · 388 gardener saves
Centaurea: the varieties gardeners actually grow
Centaurea, the genus most gardeners know as cornflower. We track 11 varieties; these are the ones gardeners actually save and plant, ranked by real saves rather than catalog marketing. Each links to full care, bloom, and live price data.
The 11 most-saved Centaurea varieties
Of 11 in the catalog — ordered by how many gardeners actually grow them.
#1 most savedBlue Cornflower
Centaurea cyanus 'Blue Diadem'
#2 most savedAmethyst in Snow Bachelor's Button
Centaurea cyanus 'Amethyst in Snow'
#3 most savedCornflower 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'
Bachelor's Button Blue Boy
Centaurea cyanus 'Blue Boy'
Mountain Bluet
Centaurea montana
Cornflower
Centaurea cyanus
Montana Blue Cornflower
Centaurea cyanus 'Montana Blue'
Velvet Centaurea
Centaurea gymnocarpa 'Velvet Centaurea'
How to grow Centaurea
What the Centaurea varieties in our catalog actually agree on — drawn from the care records of the 11 most-grown of them, not from a generic template.
The Centaurea year
- DeadheadMay–August100% of varieties
Snip spent flowers regularly to encourage continuous blooming
- PlantFebruary, March, April, September and October82% of varieties
Direct sow seeds in early spring or late fall for best results
- HarvestMay–July73% of varieties
Cut stems when flowers are half open for longest vase life
Do
- Deadhead spent flowers to encourage more blooms
- Provide full sun for optimal flowering
- Mulch to retain soil moisture
- Mulch around plants to retain moisture and suppress weeds
- Divide plants every 2-3 years to maintain vigor
Avoid
- Avoid overwatering to prevent root rot ❌
- Avoid overwatering which can cause root rot ❌
- Refrain from heavy fertilizing late in the season
- Avoid overwatering, which can cause root rot ❌
What goes wrong with Centaurea
| Problem | What you'll see | What to do |
|---|---|---|
| Aphids | Sticky residue and distorted leaves | Use insecticidal soap or neem oil |
| Powdery Mildew | White powder on leaves | Apply a fungicide or improve air circulation |
| Leaf miners | Tunnel patterns on leaves | Use organic insecticides and remove affected foliage |
| Powdery mildew | White powder on leaves | Improve air circulation and apply organic fungicide |
| Root Rot | Wilting and yellowing leaves | Ensure well-draining soil and reduce watering |
| Powdery Mildew | White powdery coating on leaves | Improve air circulation and apply fungicide as needed |
| Powdery mildew | White powder on leaves | Improve air circulation and apply sulfur fungicide |
Making more Centaurea
Seed
- Sow seeds outdoors in early spring after last frost.
- Keep soil moist for germination, which takes 7-14 days.
- Thin seedlings to 12 inches apart once established.
Cuttings
- Take semi-hardwood cuttings in late summer.
- Dip cuttings in rooting hormone and plant in moist soil.
- Maintain humidity and wait 6 weeks for roots to develop.
Centaurea questions
How many types of Centaurea are there?
The Sow catalog tracks 11 distinct Centaurea varieties. The most popular — ranked by 388 real gardener saves — are shown first above.
What zones does Centaurea grow in?
Across its varieties, Centaurea covers USDA Zones 4–10. Individual varieties differ — each plant page lists its exact range, and Sow filters the catalog to your zone automatically.
When does Centaurea bloom?
Most Centaurea varieties bloom in late spring, early summer, late spring to summer. Staggering early, mid, and late varieties extends the genus's season in one bed.
Which Centaurea should I choose?
Start from the most-saved varieties above — popularity across thousands of gardens is a strong signal of reliability — then filter by your zone and sun. In the Sow app you can preview any of them in a photo of your actual yard before you buy.
Keep exploring
Design with Centaurea in your own yard
Snap a photo of your space and see these varieties planted in it — sized correctly, matched to your zone, with care reminders included.
