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A picture of a Common Knapweed

Common Knapweed

Centaurea nigra

Also known as

Lesser Knapweed, Hardheads, Bell Weed, Black Centaury, Black Knapweed, Bowl Weed, Bull Weed, Button Weed, Churl's Head, Club Weed, Crop Weed, Hard Weed, Horse Knops, Iron Hard, Iron Heads, Iron Weed, Knob Weed, Knot Weed, Loggerheads, Spanish Buttons, Sweeps, Tassel, Black Starthistle

Full Sun
Moderate watering
Frost Hardy

7a

USDA zone

-18°C

Minimum temperature

Expected size

Height
Spread

1m

Max

50cm

50cm

Min

10cm

5 years to reach maturity

Flowering

    • spring
    • summer
    • autumn
    • winter

    More images

    A photo of Common Knapweed
    A photo of Common Knapweed
    A photo of Common Knapweed
    A photo of Common Knapweed
    A photo of Common Knapweed

    Special Features

    Attracts butterflies