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Black Horehound Ballota nigra 

 
 
Attracts BeesBees are attracted to this plant
Attracts ButterfliesButterflies are attracted to this plant
Attracts HoverfliesHoverflies are attracted to this plant
Perennial Life CyclePerennial life cycle
Two-Lipped FlowersTwo-lipped flowers
Purple FlowersPurple flowers
1 Petal1 petal
Jun-Sep Flowering
period
Delta-Shaped LeavesDelta-shaped leaves
Toothed LeavesToothed leaves
Square StemSquare stem
Tap RootTap root
100cmMaximum height
 
 
  Main image of Black Horehound

© 2020-2025 Adrian Briggs

 

Black Horehound is a native perennial plant of the UK, typically found growing in hedgerows and waste ground, to a mature height of up to 100cm.

Black Horehound has purple flowers borne in dense whorls around its stems. Initially green sepal tubes, stems and leaves gradually 'blacken' over time to a dark reddish-brown, giving rise to the colour reference in its name. The name 'Horehound' is derived from the Old English for 'downy plant', which is apt, given that the Black Horehound not only has downy stems and leaves but also has a hairy upper hood to its flowers. Black Horehound can also be identified by its pungent musty smell.

Botanic classification and naming: Black Horehound is a member of the Mint (Lamiaceae) family. The genus name 'Ballota' identifies the plant as a Horehound and its species name 'nigra' means 'black'.

 
Flower of Black Horehound

© 2021 Adrian Briggs

 

Flowers:
Black Horehound usually flowers between June and September.

Flower colour:

Flower Colour Purple

Purple

Flower shape:

Flower Shape  Two-lipped

Two-lipped

Petals:

Petal Number =  1

1

Leaf of Black Horehound

© 2021 Adrian Briggs

 

Leaves:

Leaf Shape:

Leaf Shape is Delta

Delta

Or:

Alternative Leaf Shape is Oval

Oval

Leaf Margins:

Leaf Margin is toothed

toothed

Stem of Black Horehound

© 2021 Adrian Briggs

 

Stem and Roots:

Stem shape:

Stem Shape is Square

Square

Root type:

Root Type is Tap

Tap