Cornflower, Cornflower is also called Bachelors Button, Blue Cap, Blue poppy

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 9 min read

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Article Summary

Key Takeaways

This article explains Facts of Cornflower in simple medical language.
This article explains Cornflower Scientific Classification in simple medical language.
This article explains Traditional uses in simple medical language.

Educational health guideWritten for patient understanding and clinical awareness.

Reviewed content workflowUse writer and reviewer profiles for stronger trust.

Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

Severe symptoms, breathing difficulty, fainting, confusion, or rapidly worsening illness.
New weakness, severe pain, high fever, or symptoms after a serious injury.
Any symptom that feels urgent, unusual, or unsafe for the patient.

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

See a doctor

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Learn safely

Use this article to understand possible causes, tests, treatment options, prevention, and questions to ask your clinician.

Cornflower is a member of daisy family renowned for its vibrant blue flowers. Cornflower is also called Bachelors Button, Blue Cap, Blue Bottle, Blue poppy, Blueblow, Bluebonnets, Boutonniere Flower, Bluebottle, Cornflower, Cyani Flower, Hurtsickle, Garden Cornflower, Bachelor’s Button Knapweed and Garden knapweed. Scientifically known as Centaurea cyanus, is a robust and herbaceous annual plant growing to the height of 20 to 85 cm with greygreen, slender and distally branched stem. Leaves are alternate, gray-tomentose measuring 3 to 10 cm. Flower heads are rounded or flat topped cymbiform arrays and about 2.5 to 3.5 cm diameter borne on long peduncles surrounded by campanulate involucral bracts. Phyllaries are ovate to oblong, green and tomentose to subglabrous. Margins and erect appendages are white to dark brown or black fringed with slender teeth. Ray florets are violet blue to blue, 25 to 35, obliquely funnel shaped with tip lobed. Disc florets are tubular, violet blue in the center of capitula. It bears an elliptic and flattish fruit which is yellowish and fine haired about 3.5 to 4 mm long having short tip and stiff unequal bristles. Cornflower plant thrives well in common garden soil but prefers well drained rich soil and sunny locations. It is able to withstand arid and low fertility, alkaline soils. When the plants are well established, it could tolerate drought. Being an ornamental plant, it consists of several named varieties. Cornflower is able to hold the color even when dried.

Facts of Cornflower

Name	Cornflower
Scientific Name	Centaurea cyanus
Native	Cornflower is indigenous to Europe.
Common/English Name	Bachelors Button, Blue Cap, Blue Bottle, Blue poppy, Blueblow, Bluebonnets, Boutonniere Flower, Bluebottle, Cornfl ower, Cyani Flower, Hurtsickle, Garden Cornflower, Bachelor’s Button Knapweed, Garden knapweed
Name in Other Languages	Brazil: Escovinha, Fidalguinhos; Catalan: Angelet, Angelina, Blauet, Blavet; Czech: Chrpa Modrá, Chrpa Polní, Chrpa Modrák; Chinese: 矢车菊, 蓝芙蓉, 车轮花; Danish: Kornblomst; Dutch: Korenbloem; Eastonian: Rukkilill; Esperanto: Cejano, Grenfl oro, Centaŭreo Grenkampa; Finnish: Ruiskukka, Ruiskaunokki; French: Barbeau, Bleuet, Barbeau Bleu, Bleuet Des Champs, Casse Lunette, Centaurée Bleuet, Centaurée Bleue, Centaurée Bluet, Centaurée laineuse, Faux Safran; Gaelic: Gormán; German: Blauchrut, Blaumütze, Blaue Kornblume, Cyane, Hunger, Hungerblume, Kornbeisser, Kaiserblume, Kornfresser, Kornblume, Kornmutter, Kornnelke, Kreuzblume, Kornnägeli, Rockenblume, Roggenblume, Sichel-blume, Schanelke, Tremisse, Sträpsen, Trämpsen, Ziegenbein, Zachariasblume; Hungarian: Kék Búzavirág, Búzavirág, Vetési Búzavirág; Icelandic: Akurprýði, Kornblóm, Garðakornblóm; Italian: Fiordaliso, Fiordaliso Vero; Japanese: Yaguruma-Giku; Norwegian: Åkernellik, Kornblom, Knoppurt, Kornblomst; Polish: Bławatek, Kolendra Siewna, Chaber Blawatek, Modrak; Portuguese: Ambreta, Ciano, Centáurea, Fidalguinhos, Lóios, Lóios-Dos-Jardins, Saudades, Loucos-Dos-Jardins; Romanian: Albastrele; Russian: vasiljok posevnoj, vasiljok sinij, vasilyok posevnoy (василйок посевной), vasilyok siniy (василйок синий); Slovašcina: Escovinha, Fidalguinhos; Slovencina: Nevädza Poľná; Spanish: Aciano, Centaura Azul, Azulejo, Pincel; Swedish: Blågubbar, Blåklätt, Blåklint, Klint; Turkish: Peygamber Ciçeği, Maviçiçek; Welsh: Glas Yr Ŷd, Penlas Yr Ŷd
Plant Growth Habit	Robust, herbaceous annual
Plant Size	20 to 85 cm
Leaves	Gray-tomentose, linear-lanceolate, 3 to 10 cm
Flowering Season	Summer
Fruit shape & size	Flat
Fruit color	Yellowish
Taste	Resembles sweet cucumber
Plant parts used	Flowers, leaves and seeds

Cornflower Scientific Classification

Scientific Name: Centaurea cyanus

Rank	Scientific Name & (Common Name)
Kingdom	Plantae (Plants)
Subkingdom	Viridiplantae
Infrakingdom	Streptophyta (Land plants)
Superdivision	Embryophyta
Division	Tracheophyta (Vascular plants, tracheophytes)
Class	Magnoliopsida
Order	Asterales
Family	Asteraceae (Sunflowers, tournesols)
Genus	Centaurea L. (Knapweed, star thistle)
Species	Centaurea cyanus L. (Garden cornflower, cornflower, bachelor’s button)
Synonyms	Centaurea concinna (Boiss. & A. Huet.) Trautv. Centaurea concinna Willd. ex Steud. Centaurea cyaneum St.-Lag. Centaurea cyanocephala Velen. Centaurea cyanus subsp. coa Rech.f. Centaurea cyanus subsp. cyanus Centaurea cyanus var. cyanus Centaurea cyanus var. denudata Suksd. Centaurea cynarocephala Velen., 1886 Centaurea hoffmanniana Asch. Centaurea hortorum Pau Centaurea lanata Roxb. Centaurea pulcherrima Wight ex DC. Centaurea pulchra DC. Centaurea rhizocephala Trautv. Centaurea segetalis Salisb. Centaurea umbrosa Huet & Reut. Centaurea umbrosa Reut. Cyanus arvensis Moench Cyanus cyanus (L.) Hill Cyanus cyanus Hill Cyanus dentatofolius Gilib. Cyanus segetum Hill Cyanus vulgaris Delarb. Cyanus vulgaris Delarbre Jacea segetalis Lam. Jacea segetalis Lam. ex Steud. Jacea segetum (Hill) Lam. Leucacantha cyanus (L.) Nieuwl. & Lunell Setachna cyanus (L.) Dulac

Leaves

Lower leaves have a curved lobe but the most of the leaves are narrow lanceolate which grows in whorls around long stems.

Flowers

The center flowers are darker and are surrounded by overlapping bracts about 1.5 inches across. Mostly Cornflowers are true blue but could be found in the shades of white, lavender, pink, maroon and two-tones.

Traditional uses

The infusion is used for treating constipation, dropsy, kidney ailments and mouth wash for ulcers as well as bleeding gums.
The eyewash prepared from cornflower blossoms for conjunctivitis, eye ailments and tired, strained or puffy eyes.
It improves resistance to infections.
The tea is used for promoting digestion and also detoxifies liver.
Flower bud infusion is used for treating urinary tract infections.
When used internally as a tea helps to ward off common cold.
Seeds infusion is used in Europe to cure constipation.
Apply the petals infusion internally for treating yeast infections.
It stops bleeding in open wounds as well as bleeding gums.
Apply the crushed leaves as a poultice to aching muscles, bruises and inflamed joints.
The infusion of flower heads (dried or fresh) is used as a wash on scalp to eliminate dandruff.
It possesses astringent qualities which help to treat dark circles and puffy eyes.
The flowers paste is useful in bruising.
It is helpful for ulcers and lowers the appearance of wrinkles.
The leaves decoction is used for rheumatic complaints and if used as a hair rinse treats scalp eczema.
It is used to regulate menstrual disorder.
Its infusion can be used in the treatment of mouth ulcers and bleeding gums.
It is used to cure irritated and inflamed skin.
It is used in strengthening nails and prevents nail infections.
It is beneficial for those people experiencing stress, anxiety, depression and other nervous system disorders.

Precautions

People having an allergy should completely avoid it.
Consult the health practitioner by the people having other illnesses, disorders and medical conditions.

How to Eat

Flowers are consumed raw or cooked or added to salads and vegetables.
Young shoots are also consumed.
It is also used in desserts.
Petals are used in cornbread muffins.
It is used as a garnish.

Other Facts

The leaves are arranged alternately on stem.
Flowers are arranged in flower heads on top of flowering stem. Flower heads are located centrally and is made of disk florets.
Flowers are found in various shades of blue, pink, white, purple, red and maroon color.
Cornflower could produce single and double blooms and contains both reproductive organs.
Flowers being a rich source of nectar attract butterflies and bees which are the main pollinators of the plant.
It is propagated by seed.
It is also used as a source of blue dye.
Cornflower is regarded as the national flower of Estonia.
It is an annual plant which completes its life cycle in one year.
The edible flowers have sweet cucumber like taste.
The honey prepared from these flowers is regarded to be the best.

References

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

Write when the problem started and how it changed.
Bring old prescriptions, investigation reports, and current medicines.
Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

What is the most likely cause of my symptoms?
Which danger signs mean I should go to hospital quickly?
Which tests are necessary now, and which can wait?
How should I take medicines safely and what side effects should I watch for?
When should I come for follow-up?

Tests to discuss

Vital signs: temperature, pulse, blood pressure, oxygen saturation
Basic physical examination by a clinician
CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

Avoid heavy lifting, sudden bending, and prolonged bed rest.
Use comfortable posture and gentle movement as tolerated.
Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

Do not start antibiotics without a proper medical decision.
Do not use steroid tablets or injections casually for quick relief.
Do not delay emergency care because of home remedies.

Get urgent help if

Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.

Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider

Tests to discuss with doctor

Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
Relevant blood, urine, imaging, or specialist tests only after clinical assessment

Questions to ask

What is the most likely cause of my symptoms?
Which warning signs mean I should go to emergency care?
Which tests are really needed now?
Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Go to emergency care if you notice:

Severe or rapidly worsening symptoms
Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration

Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.

Step 1
Check danger signs first
If danger signs are present, seek emergency care and do not wait for online information.
Step 2
Record the symptom story
Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.
Step 3
Visit a qualified clinician
A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.
Step 4
Do only useful tests
Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.
Step 5
Follow up and return early if worse
If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips

Take a written symptom diary and all previous prescriptions/test reports.
Do not hide medicines already taken, even herbal or over-the-counter medicines.
Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

Ask a health question safely

Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.