Blue billygoat weed
Ageratum houstonianum, Fam. Asteraceae
Erect or semi-prostrate annual or short-lived perennial herb 0.3-1m. Stems and leaves softly hairy with a characteristic odour when crushed.
Other invasive plants
Invasive plants that are not prohibited or restricted invasive plants, but are known to spread readily and cause negative impacts, within the region.
|Form or habit:||Herb|
Opposite at base, later alternate, triangular shaped with heart-shaped to square base, regular rounded teeth along margin.
|Flower description:||Blue- mauve, small fluffy heads; borne in terminal clusters.|
|Fruit description:||Brown fruit, 'seeds' black, about 2mm long, tipped by a ring of chaff-like scales.|
|Food source for:|
|Toxicity:||Toxic or irritant to domestic pets|
|Notes:||Spread by: wind, water. Invades/threats: weeds of disturbed areas. Cause harvesting difficulties in cane crops. Ageratum conyzoides is the more common species in this region then A. houstonianum which has seldom been recorded. Environmental weed.|
|Information sources:||Mackay Regional Pest Management Group (2018) Weeds of the Mackay Whitsunday Region Second Edition.|