Ground-elder was likely introduced into the UK by the Romans and has since become naturalised. A medium-sized umbellifer, it is an invasive weed of shady places, gardens and roadsides.

This bizarre bug can be found on plants in woodland rides and clearings.

A creeping and climbing plant of cultivated ground, Field Bindweed can become a pest in places as it stops other plants from growing. It has creamy, sometimes striped, large flowers, and arrow-…

This distinctive bug is often seen basking on low-growing plants in spring and summer.

The white-clawed crayfish is a freshwater, bronze-coloured crustacean with pale undersides to its claws - hence the name. It is under threat from an invasive and introduced species of crayfish.…

The Leyland cypress, or 'Leylandii', is a notorious tree that has been widely planted for its fast-growing nature. It easily can get out of control, shading gardens at the expense of…

As its name suggests, Himalayan balsam is from the Himalayas and was introduced here in 1839. It now an invasive weed of riverbanks and ditches, where it prevents native species from growing.