Field Scabious
Knautia arvensis (L.) Coult.
- light
- Full sun
- water
- —
- tall
- 1.2 m
- wide
- 30 cm
Caprifoliaceae
Also called Bluebuttons, Field scabiosa
Formerly Anisodens arvensis, Columbaria pratensis, Knautia alboi, Knautia alpigena, and 52 more
When it flowers
Not known yet in the tropics: too few flowering observations to read a season from.
Read from iNaturalist photographs of it in flower. A month counts at 50% of the best month's flowering share (smoothed over three months) and 10% of its flowering count, from at least 100 flowering observations in the band.
If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.
Something wrong with it?About it
- Grows as
- Biennial or perennialKew's checklist, not yet checked
- Climate
- TemperateKew's checklist, not yet checked
- Wild in
- Europe to Siberia and N. CaucasusKew's checklist, not yet checked
- Light
- Full sun (6 h or more)Read from RHS, one source
- Height
- 99 cm to 1.5 mRead from RHS, one source
- Spread
- 10 cm to 51 cmRead from RHS, one source
- Flowers
- Purple, blueRead from RHS, one source
- Coldest it survives
- -20 °C (USDA zone 6b)Read from RHS, one source
Not known yet: water, heat, hottest it survives.
In other languages (12)
- German
- Acker-Witwenblume, Knopfblume, Wiesen-Witwenblume
- root
- KNAARV, reyð kúpa, Cab an ghasáin
- Finnish
- ruusuruoho, ketoruusuruoho
- French
- Knautie des champs, Scabieuse des champs, Oreille-d'âne
- Danish
- Blåhat
- Russian
- Короставник полевой
- Czech
- chrastavec rolní
- Greek
- Κναούτια η αρουραία
- Estonian
- harilik äiatar
- Norwegian Bokmål
- rødknapp
- Dutch
- Beemdkroon, beemdkroon
- Polish
- Świerzbnica polna, świerzbnica polna
Where this comes from
- iNaturalist, read 2026-10-25, CC0-1.0 (observation counts)
- Wikidata, read 2026-10-25, CC0-1.0
- Kew's checklist, read 2026-10-24, CC-BY-4.0
- RHS, read 2026-10-25, fact, cited
- Wikimedia Commons, read 2026-10-25, CC BY-SA 4.0
- iNaturalist, read 2026-10-25, CC BY
- iNaturalist, read 2026-10-25, CC BY
- iNaturalist, read 2026-10-25, CC BY
- 3D model: Knautia arvensis (built for Vanagrha) by Vanagrha, own
A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.