Bull thistle (Cirsium vulgare) is another aggressive, noxious weed to watch out for. Discover more invasive flowers you may find in your yard. Native Alternatives to Grow Instead of Thistle.

There are 5 non-native invasive noxious thistles – Bull thistle Cirsium vulgare, Musk thistle Carduus nutans, Scotch thistle Onopordum acanthium and Onopordum tauricum, Plumeless thistle Carduus ...

The ones with small flowers are Italian thistle (Carduus pycnocephalus); those with the larger round flower are bull thistle (Cirsium vulgare). And there is some yellow-flowering star thistle ...

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

• Bull/spear thistle (Cirsium vulgare) leaves are dark green with deeply toothed leaf margins, thorns on leaves and stems and stiff hairs on the leaves.It also has a tap root that can be cut ...

Cirsium vulgare is a biennial that tends to appear on neglected ground and in arable fields. The seeds from which it reproduces are soft and cotton-like, dispersed on the wind.

Blackgrass, an annual grass that is non-native to Ireland, has been designated as a noxious weed for the first time. Agriculture Minister Martin Heydon has listed blackgrass in a new statutory ...