Weed Habitat 

• Spreads rapidly along roadsides and railway lines.
• It invades pastures and annual crops.
• And is also invasive in less-disturbed woodland habitats.

Description 

• An annual to short-lived perennial herb, usually growing from 40-80cm tall, but can grow to 1meter.
• Flowers throughout the year, but most commonly after onset of wet season.
• Flowers are an intense lilac-blue colour. (Which can be confused with “bluetops”)
• Leaves are hairy and toothed along edges. Crushed leaves emit a sharp, unpleasant aroma.
• Each plant produces hundreds or even thousands of small black seeds.