It is a gray-leaved herbaceous perennial plant, somewhat resembling mint in appearance, which grows to 25–45 cm tall. The leaves are 2–5 cm long with a densely crinkled surface, and are covered in downy hairs. The flowers are white, borne in clusters on the upper part of the main stem.
As an invasive weed 
Horehound was introduced to southern Australia in the 19th century as a medicinal herb. It became a weed of native grasslands and pastures where it was introduced with settlers’ livestock, and was first declared under noxious weeds legislation. It now appears to have reached its full potential distribution.
It occupies disturbed or overgrazed ground, and is favoured by grazing because it is highly unpalatable to livestock. It may persist in native vegetation that has been grazed.
As biocontrol 
In astrology 
Horehound bug, a common insect that feeds on White Horehound
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (July 2009)|
- Tennant, John (1727). Every Man His Own Doctor. p10.
- Everist, D.L. (1981) Poisonous Plants of Australia. 3rd edn (Angus & Robertson: Sydney). ISBN 0-207-14228-9
- Parsons, W. & Cuthbertson, E. (2001) Noxious Weeds of Australia. 2nd edn (CSIRO Publishing: Collingwood). ISBN 0-643-06514-8
- Jepson Manual Treatment
Media related to Marrubium vulgare at Wikimedia Commons