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.

Heather Angel / Wildflower drifts on disused railway line, flowers include Rosebay willowherb (Epilobium angustifolium), Yellow loosestrife (Lysimachia vulgaris) and Oxeye daisy (Leucanthemum vulgare). Haskayne Cutti...

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

Chris Mattison / Yellow loosestrife (Lysimachia vulgaris) growing along a lane, Monmouthshire, Wales, UK.

Chris Mattison / Yellow loosestrife (Lysimachia vulgaris) growing along a lane, Monmouthshire, Wales, UK.

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 / Tracking shot looking over a meadow, with Great burnet (Sanguisorba officinalis) and Garden loosestrife (Lysimachia vulgaris) in flower, 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.

Nick Upton / Yellow loosestrife / Dotted loosestrife (Lysimachia punctata) flowering on a roadside verge, Ceredigon, Wales, UK, June.

Will Watson / Yellow loosestrife (Lysimachia vulgaris), among Common Reed (Phragmites australis), Het Goor Asbroek, Belgium, June.

Ernie Janes / Colourful garden with Phlox, Crocosmia and Loosestrife (Lythum virgatum) seen through lattice window . England, UK.

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.

Dave Bevan / Red admiral (Vanessa atalanta) nectaring on Gooseneck loosestrife (Lysimachia clethroides), Carmarthenshire, Wales, UK. September.

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.

Chris Mattison / Sea-milkwort (Glaux maritima) growing on rocks, Norwick, Unst, Shetlands, Scotland, UK, June.

Chris Mattison / Sea-milkwort (Glaux maritima) growing on rocks, Norwick, Unst, Shetlands, Scotland, UK, June.

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

Nick Upton / Yellow pimpernel (Lysimachia nemorum) flowering on damp woodland edge, Nottinghamshire, UK, June.

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.

Chris Mattison / Yellow loosestrife (Lysimachia vulgaris) in flower, growing at the edge of a country road, near Hathersage, Deryshire, Peak District, 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

LYNN M. STONE / Bumble bee (Bombas sp) on Whorled loosestrife (Lysimachia quadrifolia) flower, East Haddam, Connecticut, USA, July

Florian Möllers / Tufted loosestife (Lysimachia thyrsiflora) flowers, Germany, June

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

Ian Lockwood / Loosestrife (Lysimachia leschenaultiana) a rare and beautfiul plant found in marshes in elevated hill ranges of Western Ghats, Southern India

Russell Cooper / Banded Demoiselle (Calopteryx splendens) female after a rain shower, at rest on Purple Loosestrife flowers. South London, England, UK.

Andy Sands / Loosetrife Weevil (Nanophyes marmoratus Goeze) on petal of Purple Loosetrife flower, UK, Captive

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

Silvia Reiche / Map Butterfly (Araschnia levana) on Yellow Loosestrife (Lysimachia vulgaris), Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Map Butterfly (Araschnia levana) on Yellow Loosestrife (Lysimachia vulgaris), Hoogeloon, Noord-Brabant, Netherlands

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

Andy Sands / Holly Blue butterfly (Celastrina argiolus) wings closed, feeding on Purple Loosestrife, West Sussex, England, UK

Andy Sands / Dark Bush Cricket (Pholidoptera griseoaptera) On Purple Loosestrife, Hertfordshire, England, UK

Andy Sands / Southern Hawker Dragonfly (Aeshna cyanea) resting on Purple Loosestrife flower, Hertfordshire, England, UK

Ross Hoddinott / Small skipper butterfly {Thymelicus sylvestris} on Purple loosestrife flower, covered in morning dew, with proboscis extended, Tamar lakes, Cornwall, UK

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

Will Watson / Worcester cathedral, meadow and drainage ditch with wild flowers, England Purple

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

Rod Williams / Comma butterfly (Polygonia C-album) feeding on Purple Loosestrife flowers, Barn Elms, London, UK, July

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

Paul Harcourt Davies / Scarlet pimpernel (Anagallis arvensis) in flower, nr Peschici, Gargano, Puglia, Italy. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, in flower close up, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, and Southern bird's-foot-trefoil (Lotus ornithopodioides) in flower, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, in flower, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, in flower, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Anagallis arvensis) in flower. Buckland Park Lake, Surrey, UK. August.

Linda Pitkin / Scarlet pimpernel (Anagallis arvensis) in flower. Buckland Park Lake, Surrey, UK. August.

Linda Pitkin / Yellow pimpernel (Lysimachia nemorum) in flower. Surrey, UK. May.

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.

Paul Harcourt Davies / Yellow loosestrife (Lysimachia vulgaris) in flower, Terni, Umbria, Italy. July.

Nick Upton / Yellow loosestrife (Lysimachia vulgaris) flowering in a damp meadow bordering Kenfig Pool, Kenfig National Nature Reserve, Glamorgan, Wales, UK, July.

Nick Upton / Yellow loosestrife (Lysimachia vulgaris) flowering in a damp meadow bordering Kenfig Pool, Kenfig National Nature Reserve, Glamorgan, Wales, UK, July.