Photo: Gideon Pisanty ( Gidip )CC BY 3.0via Wikimedia Commonsresized / cropped
Blue Cornflower Plant Care
Centaurea ammocyanus Boiss.
Updated · Sources · How we source care data
This plant's striking deep blue petals are its most distinctive feature, originating from the Mediterranean region. Plant collectors are drawn to Centaurea ammocyanus for its unique color and ability to attract pollinators to the garden with its vibrant blooms.
Every 7–14 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Blue Cornflower?
Water Blue 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.
Where Is the Blue Cornflower Native To?
What Is the Blue Cornflower?
Blue Cornflower (Centaurea ammocyanus) belongs to the Asteraceae family within the Centaurea genus. Blue Cornflower is native to Western Asia. Blue Cornflower is also known as Cornflower, Ammocyanus arabicus.
Blue Cornflower displays an upright, branching perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Blue Cornflower produces showy, thistle-like flower heads in various colors.
Leaf size: approximately 6 inches.
How Often Should You Water a Blue Cornflower?
Centaurea ammocyanus 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 Blue Cornflower Need?
Blue Cornflower thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Blue Cornflower Prefer?
Centaurea ammocyanus grows best at temperatures of 50–80°F. Blue Cornflower prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Blue Cornflower?
Well-draining sandy loam with added organic matter for moisture retention. Good drainage is essential for Blue Cornflower to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Blue Cornflower?
Feed Blue 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 Blue 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 Blue Cornflower?
Blue Cornflower can be propagated through seeds, division of clumps. Similar propagation techniques also apply to species plantarum plant care, which shares the same genus.
Is the Blue Cornflower Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Blue Cornflower, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
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 Blue Cornflower?
Blue 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 Blue Cornflower Need?
Blue Cornflower grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Blue Cornflower is native to Western Asia. In cooler regions, grow Blue Cornflower as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Blue 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.
Blue Cornflower thrives in bright light and direct sun — see other bright-light plants.
More Centaurea Species
Other Centaurea species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Centaurea ammocyanus Boiss., family Asteraceae (first published in Diagn. Pl. Orient. 10: 109 (1849)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Blue Cornflower, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Gideon Pisanty ( Gidip ), CC BY 3.0, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- 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.
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