Introduced from Japan in the 19th century, Japanese knotweed is now an invasive non-native plant of many riverbanks, waste grounds and roadside verges, where it prevents native species from…

These non-native limpets arrived from America in the 19th century and are now widespread in the UK. They form stacks and have a specially adapted shell which, when flipped upside down, looks like…

Often growing in swathes along a roadside or field margin, the oxeye daisy is just as at home in traditional hay meadows. The large, white, daisy-like flowers are easy to identify.