Sow thistle, milk thistle
Sonchus oleraceus, Fam. Asteraceae
Erect, soft textured annual herb, 1.2-2m tall with green or bluish-green stems and milky sap.
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|
Simple, alternate, sometimes initially forming a basal rosette, lower leaves up to 250 x 100mm, deeply divided into irregular lobes, the end lobe spade-shaped, margins toothed; upper leaves decreasing in size, becoming narrower, tapering into the tip and clasping the stem with a pair of pointed lobes at base.
|Flower description:||Fluffy heads, 10-20mm wide, yellow ‘petals’ and centres; borne in groups on long stout and hollow flowering stems.|
|Fruit description:||Brown ‘seeds’ 2.5-4mm long, compressed, longitudinally ribbed, transversely wrinkled and topped with ‘parachute’ of white fluffy hairs 5-8mm long.|
|Food source for:|
|Toxicity:||No toxicity known|
|Origin:||Europe, Asia and northern Africa|
|Notes:||Spread by: wind, water, and contaminated soil. Invades/threats: cropland, disturbed and waste land along roadsides, gardens. Notes: young leaves can be cooked and eaten as a vegetable. Environmental weed.|
|Information sources:||Mackay Regional Pest Management Group (2018) Weeds of the Mackay Whitsunday Region Second Edition.|