Botanical Name: Sonchus asper
Other names: Spiny sow-thistle, Spiny milk-thistle, Spiny-leaved sow-thistle, Spiny annual sow-thistle
Annual, spreading by seed which have short plumes (pappus)
of silvery-green hairs. The young basal leaves are not spiney and are a different shape to the later mature ones which arise alternately on the upright hollow stem, and can be added to
See also Wall Lettuce which has similar basal leaves.
Flowers from June to August, bright yellow.
Height - up to 90 cm.
It is easily uprooted unless it has grown in a crevice.
Weedkillers to use:-
Dichlobenil prevents emergence of
seedlings amongst established woody plants, for up to
Paraquat, Diquat kills on contact.
Glyphosate, systemic action
killing the whole plant.
Also Smooth Sow-thistle and the Perennial Sow-thistle
have similar basal leaves and bright yellow flowers.
Follow these links for further details on Weeds, Weed Removal and Weed