Mark Hamblin / 2020VISION / Male Red eyed damselfly (Erythromma najas) on Purple loosestrife (Lythrum salicaria) flower, Bedfordshire, England, UK, July 2012.

Edwin Giesbers / Konik Wild Horse (Equus ferus caballus) in grasslands with Purple loosestrife flowers (Lythrum salicaria) in foreground. The Netherlands, July.

Laurie Campbell / Robin (Erithacus rubecula) perched on dead stem of Purple loosetrife (Lythrum salicaria) Berwickshire, Scotland, December

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) flower spikes backlit in evening light, Scotland, UK, September

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) flower spikes in evening light, Scotland, UK, September

Staffan Widstrand / Wild Wonders of China / Purple loosestrife (Lythrum salicaria) found in Wu Ying District Nature Reserve, near Yichun city, Heilongjiang Province, China

Konrad Wothe / Slow motion clip of a Blue butterfly (Lycaenidae) flying and nectaring on Purple loosestrife (Lythrum salicaria), Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of a Blue butterfly (Lycaenidae) flying and nectaring on Purple loosestrife (Lythrum salicaria), disturbed by a Skipper (Thymelicus), Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of two Blue butterflies (Lycaenidae) nectaring on Purple loosestrife (Lythrum salicaria), disturbed by a Skipper (Thymelicus) Bavaria, Germany, July.

Ernie Janes / Loosestrife (Lythrum virgatum) 'Dropmore Purple' in flower garden border England, UK.

Ernie Janes / Loosestrife (Lythrum virgatum) 'Dropmore Purple' in flower garden border England, UK.

Sue Daly / Purple loosestrife (Lythrum salicaria), Jersey, British Channel Islands, August.

Stephen Dalton / Purple loosestrife (Lythrum salicaria) Sussex, England, UK, August.

Ann & Steve Toon / Purple loosestrife (Lythrum salicaria) growing by coast, Arran, Scotland, July.

Lynn M Stone / Monarch butterfly (Danaus plexippus) nectaring on Purple Loosestrife in wet meadow, East Haddam, Connecticut, USA

Lynn M Stone / Eastern tiger swallowtail butterfly (Papilio glaucus) female, nectaring on Purple Loosestrife (Lythrum salicaria) in wet meadow, East Haddam, Connecticut, USA

Philippe Clement / Purple loosestrife (Lythrum salicaria) in flower, Belgium, August.

Philippe Clement / Purple loosestrife (Lythrum salicaria) in flower, Belgium, August.

Nick Upton / Purple loosestrife (Lythrum salicaria) flower spikes, Cornwall, UK, July.

Willem Kolvoort / Purple loosestrife (Lythrum salicaria) in brook, North Holland. August.

Bert Willaert / Purple loosestrife (Lythrum salicaria) flowering. Belgium, July.

Phil Savoie / Common carder bumblebee (Bombus pascuorum) flying towards Purple loosestrife (Lythrum salicaria) flowers, Monmouthshire, Wales, UK, September.

Phil Savoie / Common carder bumblebee (Bombus pascuorum) flying towards Purple loosestrife (Lythrum salicaria) flower, Monmouthshire, Wales, UK, September.

Phil Savoie / Common carder bumblebee (Bombus pascuorum) flying towards, Purple loosestrife (Lythrum salicaria) Monmouthshire, Wales, UK, September.

Adrian Davies / Purple Loosestrife (Lythrum salicaria) in flower, Surrey, England, UK, July.

Theo Bosboom / Purple loosestrife (Lythrum salicaria) flower in the water, Meinerswijk, the Netherlands, August 2007

Theo Bosboom / Dried out Purple loosestrife (Lythrum salicaria) with snow in the background, nature area Meinerswijk, the Netherlands, January 2013

Theo Bosboom / Purple Loosestrife (Lythrum salicaria) in flower in wetland, Meinerswijk near Arnhem, the Netherlands, July 2011

Theo Bosboom / Willows and Purple loosestrife (Lythrum salicaria) in wetland, Meinerswijk near Arnhem, the Netherlands, August 2007

Theo Bosboom / Wetland area with Purple Loosestrife (Lythrum salicaria) Meinerswijk near Arnhem, the Netherlands, on a summer evening, August 2007

Theo Bosboom / Wetland area with Purple Loosestrife (Lythrum salicaria) Meinerswijk near Arnhem, the Netherlands, on a summer evening, August 2007

Niall Benvie / Purple Loosestrife (Lythrum salicaria) in flower against white background. France, August.

Mark Hamblin / 2020VISION / Male Banded demoiselle (Calopteryx splendens) on Purple loosestrife (Lythrum salicaria) flower, Bedfordshire, England, UK, July 2012. Did you know? Dragonflies and damselflies are easy to distinguish...

Mark Hamblin / 2020VISION / Male Banded demoiselle (Calopteryx splendens) on Purple loosestrife (Lythrum salicaria) flower, Bedfordshire, England, UK, July 2012.

Mark Hamblin / 2020VISION / Male Banded demoiselle (Calopteryx splendens) on Purple loosestrife (Lythrum salicaria) flower, Bedfordshire, England, UK, July 2012.

Mark Hamblin / 2020VISION / Male Banded demoiselle (Calopteryx splendens) on Purple loosestrife (Lythrum salicaria) flower, Bedfordshire, England, UK, July 2012.

Mark Hamblin / 2020VISION / Male Banded demoiselle (Calopteryx splendens) on Purple loosestrife (Lythrum salicaria) flower, Bedfordshire, England, UK, July 2012.

Mark Hamblin / 2020VISION / Male Banded demoiselle (Calopteryx splendens) on Purple loosestrife (Lythrum salicaria) flower, Bedfordshire, England, UK, July 2012.

Mark Hamblin / 2020VISION / Flowering Purple loosestrife (Lythrum salicaria), Bedfordshire, England, UK, July.

Doug Wechsler / Snowberry clearwing (Hemaris diffinis) feeding at a Purple loosestrife (Lythrum salicaria) flower, Salem County, New Jersey, USA, August.

Gary K. Smith / Purple loosestrife (Lythrum salicaria) in flower, UK, July

Ross Hoddinott / Garden tiger moth (Arctia caja) resting on Purple loosestrife (Lythrum salicaria), Dunsdon Nature Reserve, Devon, UK, June

Wild Wonders of Europe / Radisics / Purple loosestrife (Lythrum salicaria) in flower, Hortobagy National Park, Hungary, July 2009

Guy Edwardes / Marbled white butterfly (Melanargia galathea) on Purple-loosestrife (Lythrum salicaria) flower spike, Dorset, UK, July

MYN / Niall Benvie / Purple loosestrife {Lythrum salicaria} Scotland, UK meetyourneighbours.net project

Bernard Castelein / Purple loosestrife flowers {Lythrum salicaria} Belgium

Simon Colmer / Purple Loosestrife (Lythrum salicaria) Stedham Common Nature Reserve, Sussex, UK

Philippe Clement / Purple loosestrife in flower {Lythrum salicaria} France

Philippe Clement / Purple loosestrife in flower {Lythrum salicaria} France

Philippe Clement / Purple loosestrife in flower {Lythrum salicaria} France

Jan Vermeer / Purple Loosestrife (Lythrum salicaria) flowering invasive plant, native to Asia, introduced into North America

Tony Evans / Purple loosestrife {Lythrum salicaria} beside water, Norfolk Broads, England

Geoff Simpson / Purple loosestrife flowering {Lythrium salicaria} Lancashire, UK

Konrad Wothe / Silver-studded Blue (Plebejus argus) butterflies on Purple Loosestrife (Lythrum salicaria), Upper Bavaria, Germany

Benjamin Olson / Purple Loosestrife (Lythrum salicaria), invasive plant flowering in lake, Lebanon Hills Regional Park, Minnesota

Benjamin Olson / Purple Loosestrife (Lythrum salicaria), invasive plant flowering in lake, Lebanon Hills Regional Park, Minnesota

Bernard Castelein / Green-veined white butterfly (Pieris napi) resting on Purple loosestrife (Lythrum salicaria), Brasschaat, Belgium. August.

Konrad Wothe / Common brimstone butterfly (Gonepteryx rhamni) in flight over Purple loosestrife (Lythrum salicaria) flowers in summer, Upper Bavaria, Germany. July.

Nick Upton / Common carder bumblebee (Bombus pascuorum) nectaring on Purple loosestrife (Lythrum salicaria) flowers in marshland, Gloucestershire, England, UK. August.

Nick Upton / Muslin moth (Diaphora mendica) caterpillar feeding on Purple loosestrife (Lythrum salicaria) leaves, Pembrokeshire, Wales, UK. August.

Adrian Davies / Dark dagger moth (Acronicta tridens) larva on Purple loosestrife (Lythrum salicaria), Surrey, UK. July.

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) in flower in summer, Scotland, UK. August.

SCOTLAND: The Big Picture / Purple loosetrife (Lythrum salicaria) in flower in wild garden, Scotland, UK. August.

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicari), Knapweed (Centaurea nigra) and Rosebay willowherb (Chamaenerion angustifolium) growing around garden pond, Ballinlaggan, Scotland, UK. August.

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicari), Knapweed (Centaurea nigra) and Rosebay willowherb (Chamaenerion angustifolium) growing around garden pond, Ballinlaggan, Scotland, UK. August.

SCOTLAND: The Big Picture / Rotten log and wildflowers, Purple loosestrife (Lythrum salicari), Knapweed (Centaurea nigra) and Rosebay willowherb (Chamaenerion angustifolium) growing around garden pond, Ballinlaggan, Scotland, UK...

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) in flower in summer, Scotland, UK. August.

SCOTLAND: The Big Picture / Bumblebee (Bombus sp.) on a Purple loosetrife (Lythrum salicaria) flower, Scotland, UK. August.

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) in flower in summer, Scotland, UK. August.

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) in flower in summer, Scotland, UK. August.

Konrad Wothe / Purple Loosestrife (Lythrum salicaria) flower, Bavaria, Germany

Konrad Wothe / Purple loosestrife (Lythrum salicaria), Republic of Ireland. August.

Nick Upton / Purple loosestrife (Lythrum salicaria) clump flowering in a flooded water meadow, Gloucestershire, UK, September.

Linda Pitkin / Purple-loosestrife (Lythrum salicaria) watercolour illustration.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Will Watson / Purple Loosestrife (Lythrum salicaria) growing beside a kettle hole pond, Waterloo Nature Reserve, Herefordshire, England, July.

Will Watson / Meadow Sweet (Filipendula ulmaria) and Purple Loosestrife (Lythrum salicaria), Waterloo Nature Reserve, Herefordshire Wildlife Trust, England, July.

Nick Upton / White-legged damselfly (Platycnemis pennipes) female resting on a Purple loosestrife (Lythrum salicarium) flower spike in riverside marshland, Wiltshire, UK, July.