Grzegorz Lesniewski / Riparian forest with Crack Willow (Salix fragilis), White Willow (Salix alba) and blooming Wild Cherry (Prunus avium). Bieszczady Mountains, the Carpathians, Poland, May.

Sandra Bartocha / Moor Frogs (Rana arvalis) gathered in pond to breed, with males in blue breeding colours. Crack Willow (Salix fragilis) trees grwoing along the waters edge, Germany, April

Sandra Bartocha / Moor Frog (Rana arvalis) group with males in breeding colouration with Crack Willow (Salix fragilis) trees at the waters edge, Germany, April

Terry Whittaker / 2020VISION / Willow (Salix fragilis) seed dispersal, Rutland Water, Rutland, England, UK, April. 2020VISION Book Plate.

Laurie Campbell / Dwarf / Least willow tree (Salix herbacea) growing between crack in boulder, Isle of Rum National Nature Reserve, Hebrides, Scotland, June

Grzegorz Lesniewski / Riparian forest with Crack Willow (Salix fragilis), White Willow (Salix alba) and blooming Wild Cherry (Prunus avium). Bieszczady Mountains, the Carpathians, Poland, May.

Grzegorz Lesniewski / Crack Willow (Salix fragilis) and autumn snowfall. Bieszczady National Park, the Carpathians, Poland, October 2009.

Terry Whittaker / 2020VISION / Willow (Salix fragilis) seed dispersal, Rutland Water, Rutland, UK, April

Terry Whittaker / 2020VISION / Willow (Salix fragilis) seed dispersal, Rutland Water, Rutland, UK, April

Terry Whittaker / 2020VISION / Willow (Salix fragilis) seed dispersal, Rutland Water, Rutland, UK, April

Will Watson / Hoar frost with reflections of Crack Willow (Salix fragilis) in River Avon mill-leat. Warwick Castle, England, December 2010.

Jason Smalley / Female catkins of Crack willow {Salix fragilis} UK

MYN / Niall Benvie / Male Crack willow catkin {Salix fragilis} Angus, Scotland , UK meetyourneighbours.net project

Jason Smalley / Male flower of crack willow {Salix fragilis}. Anglezarke, Lancashire.

Jason Smalley / Female catkins of crack willow (Salix fragilis) Lancashire, UK