scale bar = 1cm.

Sow Thistle - introduced (*Sonchus oleraceus)

Home..... Menu..... Common name index..... Scientific name index..... Glossary ..... Daisies....


Other names: Milk Thistle.

Family: Asteraceae (Daisy family).

Native of Europe and south-western Asia.

Occurrence: A widespread and common weed. Grows in farmland, on roadsides, lawns and gardens and disturbed bushland.


Sow Thistle is a variable species and there is much variation in leaf shape. It flowers for most of the year.
Clammy Sow Thistle (Sonchus tenerrimus) is now included in S. oleraceus.

Similar species: Rough Sow-thistle (Sonchus asper) has prickly leaves, is often stouter, and has rounded leaf bases.

Photos 1: Sow Thistle. The backward-pointing lobes at the base of the stem leaves are a distinguishing feature. Lyttleton Street.
2, 3, 4: Some of the variation in leaf shape. 5: Seed. all: Castlemaine.

imgimg imgimg