Our Mystery Plant ("Spiny sow-thistle”, Sonchus asper) is one of them. It’s an annual, growing quickly, getting to be a ...

European marsh thistle, a terrestrial and wetland herbaceous biennial in the Asteraceae family, is an invasive plant that prefers moist soils ... are alternate with deeply pinnate segments and spiny ...

However stem elongation ("bolting") occurs when the plant produces ... Scotch thistle decreases animal production by reducing the amount of pasture that livestock are prepared to eat as they avoid ...