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.