UK Flowers: Herbs, Shrubs, Vines & Trees
UK Flowers

UK Lesser KnapweedAlso known as: Black Knapweed

Herb Icon Cultivated Flower     First Aid Symbol 
Image of Lesser Knapweed
Centaurea nigra
Family: Asteraceae

Flower Properties

Property Value
English Name Lesser Knapweed
Also Known As Black Knapweed
Scientific Name Centaurea nigra
MainColor Magenta
PlantType Herb Icon Herb
Distribution Cultivated Flower Cultivated
Season Found August (Jun - Sep)
ImageUrl Centaurea-002
Photographer DP
Location Found Abbots Langley
Country Found UK
Last Updated 03 September 2026
Photo Quality A

Flower Details

Description

Centaurea nigra is a hardy perennial wildflower with tufted purple flower heads resembling thistles but without spines. It supports a wide variety of pollinators, particularly bees and butterflies, making it an important native meadow species.

Distribution

Native to Europe and widespread across the UK in grasslands, verges, and meadows.

Medicinal/Other Uses First Aid Symbol

Historically used as a mild astringent and tonic. Infusions of the flowers were sometimes used to treat mouth ulcers and sore throats.

Edibility

Not commonly eaten but considered non-toxic.

Human Toxicity
Non_Toxic

Generally safe; rare reports of mild allergic reactions in sensitive individuals handling the plant.

Pet Toxicity

Not Toxic

Active Compounds

Contains flavonoids, tannins, and phenolic acids contributing to its antioxidant activity.

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