Plant Wiki

The open plant encyclopedia

Know any plant.
Grow it well.

Snap a photo or search by any name to see how to care for it, where it comes from, whether it's safe, and a 3D model you can turn.

  • 13,000+plants with full pages
  • 365,000+plant species worldwide
  • 220+countries covered

Common in

See all

The plants people record most in your country, and ones that grow there wild.

What do you want to do?

Popular plants

Browse all plants

See them in 3D

All plants in 3D

Browse plants

Filter by what you want to do, shape, origin, country, care and safety.

Plant Wiki › Browse plants

Black Horehound

Ballota nigra

Also called Fetid Horehound

Black Horehound
Photo: Stefan.lefnaer, CC BY-SA 4.0

Black horehound is a hardy perennial herb of the mint family, found in ruins, hedges and waste ground across Europe and the Mediterranean. It is easy to grow in open ground given well-drained, alkaline soil and full sun.

Family
Lamiaceae (Mint family)
Grows as
Perennial
Light
Full sun, Part shade
Water
Water regularly while establishing, then allow the top of the soil to dry between waterings.
Soil
Loose, well-drained, alkaline or chalky soil.
Temperature
Tolerates temperatures down to about -10 °C; hardy outdoors in temperate climates.
How easy
Easy
Native range
Macaronesia, Europe to Medit. and Iran
Climate
temperate

About

Ballota nigra, the black horehound, is a perennial herb in the family Lamiaceae. It is native to Europe, the Mediterranean region and east to central Asia. It is also naturalised in Argentina, New Zealand, and the eastern United States. It blooms in the Northern Hemisphere from May to August.

Where it grows

Ballota nigra is a nitrophilous plant; it grows in ruins, fallows, and hedges at elevations up to 1,300 m (4,300 ft). It prefers loose, calcareous (alkaline) soils. It tolerates temperatures as low as -5°/-10 °C.

Uses

Usually the plant is used dry and harvested when blooming. Syrups can be made from fresh plants.

Text excerpted from the Wikipedia article Ballota nigra by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

Credits & terms

Identify a plant

Point at a leaf or flower and snap. One plant in frame works best.

Your photo
Starting camera…