Silvia Reiche / Peacock Butterfly (Inachis io) caterpillar on the leaf of a Stinging Nettle (Urtica dioica), Hoogeloon, Noord-Brabant, Netherlands

Alex Hyde / False coloured scanning electron micrograph of stinging hair from a stinging nettle {Urtica dioica}. The silicified tip is brittle and snaps off easily if the nettle is brushed. UK

Alex Hyde / False coloured scanning electron micrograph of stinging hair from a stinging nettle {Urtica dioica}. The silicified tip is brittle and snaps off easily if the nettle is brushed. UK

Nick Turner / An overgrown old gate and dry stone wall, Burford, Oxfordshire, UK

Will Watson / Blue-green algae (Cyanbacteria), Gipsywort (Lycopus europaeus), Reed Sweet-grass (Glyceria maxima) and Common Nettle (Urtica dioica) growing along edge of Great Wyrley & Essington Canal, Staffordshire...

Gary K. Smith / Peacock Butterfly {Inachis io} caterpillars feeding on Common nettle {Urtica dioica} Norfolk, UK, June

Gary K. Smith / Peacock butterfly {Inachis io} caterpillars feeding on Common nettle {Urtica dioica} Norfolk, UK, June

Rolf Nussbaumer / Bullfinch {Pyrrhula pyrrhula} female feeding on seeds of Stinging Nettle (Urtica dioica) in winter, minus 15 Celsius, feathers puffed up for warmth, Switzerland

Rolf Nussbaumer / Bullfinch {Pyrrhula pyrrhula} female feeding on seeds of Stinging Nettle (Urtica dioica) in winter, minus 15 Celsius, feathers puffed up for warmth, Switzerland

PREMAPHOTOS / Aphids (Microlophium carnosum) on a nettle (Urtica dioica) UK

Adrian Davies / Flowering Greater dodder (Cuscuta europaea), a parasitic plant, entwined around Common Nettle (Urtica dioica), UK

Adrian Davies / Flowering Greater Dodder (Cuscuta europaea), a parasitic plant, entwined around Common Nettle (Urtica dioica), UK