Nick Upton / 2020VISION / Queen Hornet (Vespa crabro) feeding on Knotweed flower (Persicaria bistorta "superba") in garden, Wiltshire, England, UK, May . Property released.

Nigel Cattlin / Redshank (Persicaria maculosa) growing as arable weed. England, UK. September.

Nigel Cattlin / Redshank (Persicaria maculosa) growing as arable weed. England, UK. September.

Nigel Cattlin / Redshank (Persicaria maculosa), an annual arable weed. Berkshire, England, UK. August.

Ernie Janes / Red bistort (Persicaria) 'Hohe Tatra' cultivated plant.

Dave Bevan / Moorhen (Gallinula chloropus) feeding chick in a pond covered with Water smartweed (Persicaria amphibia), Ceredigion, Wales, UK. July.

Dave Bevan / Pair of Moorhens (Gallinula chloropus) feeding chicks in a pond covered with Water smartweed (Persicaria amphibia), Ceredigion, Wales, UK. July.

Dave Bevan / Little grebe (Tachybaptus ruficollis) preening, surrounded by Water smartweed (Persicaria amphibia), Ceredigion, Wales, UK. July.

Paul Harcourt Davies / Bistort flowers (Persicaria bistortum), Piano Grande, Sibillini, Umbria, Italy. June 2016

Paul Harcourt Davies / Bistort (Persicaria bistortum) flower with hoverfly, Piano Grande, Sibillini, Umbria. June.

Nick Upton / Redshank / Spotted ladysthumb (Persicaria maculosa) flowering on riverbank, Wiltshire, UK, July.

Nick Upton / Redshank / Spotted ladysthumb (Persicaria maculosa) flowering on riverbank, Wiltshire, UK, July.