A competitive grass-weed with distinctive dark coloured seed heads (hence its common name) and now the most important herbicide-resistant weed of arable crops in Western Europe. More of a problem on heavier clay or silt soils, especially if drilled early and where there is minimum tillage.
A wide range of broad-leaved weeds occur in UK arable fields which have similar management
A group of competitive annual arable grassy weed species with flower heads that droop as they mature
An upright annual grassy weed. Two species of rye-grass commonly occur in the UK: perennial rye-grass (Lolium perenne) and Italian rye-grass (Lolium multiflorum). Perennial rye-grass rarely occurs as a serious weed in UK arable crops, except after rye-grass seed crops, whereas Italian rye-grass is an increasing problem, especially in autumn-sown crops.
5 species: Creeping thistle (Cirsium arvense), Spear thistle (Cirsium vulgare), Smooth sow-thistle (Sonchus oleraceus), Prickly sow-thistle (Sonchus asper) & Perennial sow-thistle (Sonchus arvensis)