Cornflower Plant Care
Centaurea cyanus L.
Updated · Sources · How we source care data
Every 7–14 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Cornflower?
Water Cornflower every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season. The ASPCA lists it as non-toxic to cats and dogs.
Where Is the Cornflower Native To?
- Albania
- Austria
- Belarus
- Belgium
- Bosnia and Herzegovina
- Bulgaria
- Croatia
- Cyprus
- Czechia
- Denmark
- Estonia
- Finland
- France
- Germany
- Greece
- Hungary
- Iceland
- Ireland
- Italy
- Latvia
- Lithuania
- Luxembourg
- Malta
- Moldova
- Montenegro
- North Macedonia
- Norway
- Poland
- Portugal
- Romania
- Russia
- Serbia
- Slovakia
- Slovenia
- Spain
- Sweden
- Switzerland
- The Netherlands
- Ukraine
- United Kingdom
What Is the Cornflower?
Cornflower (Centaurea cyanus) belongs to the Asteraceae family within the Centaurea genus. Cornflower is native to Europe. Cornflower is also known as Bachelor's Buttons, Bluebottle, Common Cornflower.
Cornflower displays an upright, branching perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Cornflower produces showy, thistle-like flower heads in various colors.
Leaf size: approximately 6 inches.
How Often Should You Water a Cornflower?
Centaurea cyanus requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Cornflower Need?
Cornflower thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Cornflower Prefer?
Centaurea cyanus grows best at temperatures of 50–80°F. Cornflower prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Cornflower?
Well-draining sandy loam with added organic matter for moisture retention. Good drainage is essential for Cornflower to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Cornflower?
Feed Cornflower every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Cornflower?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Cornflower?
Cornflower can be propagated through seeds, division of clumps.
Is the Cornflower Toxic to Pets and Children?
Non-toxic to cats and dogs
Source: ASPCA Animal Poison Control Center plant list. View the ASPCA entry
Non-toxic to humans and pets
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Cornflower?
Cornflower is susceptible to aphids, spider mites, powdery mildew. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Cornflower Need?
Cornflower grows outdoors in USDA Zone 2 – 11. It survives winters down to planting zone 2a. Cornflower is native to Europe.
Hardiness Zone
Zone 2 – 11
Keep exploring plants
Cornflower is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Centaurea genus — compare its care with other Centaurea species on PlantoScan.
Centaurea is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Cornflower thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Centaurea cyanus L., family Asteraceae (first published in Sp. Pl. : 911 (1753)) — World Flora Online record, IPNI name record, Wikidata.
- Pet toxicity: The ASPCA lists Cornflower as non-toxic to cats and dogs. Source: ASPCA Toxic and Non-Toxic Plant List.
- Hardiness zone: USDA Zone 2 – 11, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
Identify Plants Like the
Cornflower Instantly
Scan any plant with your phone camera and get instant ID, care tips, water and fertilizer reminders, and health checks — all in one app.
Free
to download
iOS & Android
platforms
Light & dark
mode
100,000+
species