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.