Creeping thistle (Cirsium arvense) and spear thistle (Cirsium vulgare) are two of just five weeds labelled “injurious” under The Weeds Act 1959.

SCOTCH or Spear thistle, proper name Cirsium vulgare, is native to Europe, Western Asia and North Africa. By Ian Read. less than 2 min read. February 12, 2016 - 6:51PM.