Pascal Tordeux / Walnut (Juglans regia) in field of ripe barley before a storm, Ribemont, Picardy, France.

Nigel Cattlin / Walnut (Juglans regia), developing leaves , necrotic with frost damage. Berkshire, England, UK. May.

Pascal Tordeux / Walnut tree (Juglans regia) in the middle of a wheat field, Viller Le Sec, Picardy, France. August

Stephen Dalton / Walnut tree (Juglans regia) in full summer leaf, Sussex, UK

Martin Gabriel / Walnut (Juglans regia) fruits, Bavaria, Germany, July

Eric Baccega / Harvest of Common walnuts (Juglans regia), Alsace, France, September.

Eric Baccega / Harvest of Common walnuts (Juglans regia), Alsace, France, September.

Eric Baccega / Harvest of Common walnuts (Juglans regia), Alsace, France, September.

Juan Manuel Borrero / Illustration of Walnut tree (Juglans regia). Detail of leaves and fruit. Pencil and watercolor painting.

Juan Manuel Borrero / Walnut tree (Juglans regia) Miralles Mountain Range, Barclelona province, Spain, April

David Woodfall / Basket of walnuts (Jugulans regia) collected in traditional peasant community, grown as cash crop. Romania, October 2010

Artur Tabor / Walnut (Juglans regia) fruit on tree, Poland