It is most likely to be confused with a closely related species called prickly sow thistle (Sonchus asper), which looks very similar but has more prickly leaves than the sow thistle. The lobes in each ...

Milk thistle (Silybum marianum ... Milk thistles' large, spiny, dark-green leaves have white marbling, which is where the plant gets its common name from, explains Amy Enfield of ScottsMiracle ...

However stem elongation ("bolting") occurs when the plant produces flowers ... However, it is the only thistle species in New Zealand that has spines on the foliage on the surface of leaves in ...

is an invasive plant that prefers moist soils. European marsh thistle frequently invades fens, wetlands, and disturbed sites such as roadside ditches. Identifying features include: typically grows 2-7 ...