Stinging Nettle leaves (Urtica dioica) covered in a dense layer of hoarfrost in Kannelyarvi. The plant is famous for its trichomes (stinging hairs). In this frozen state, the ice crystals cling preferentially to these fine hairs and the serrated edges of the leaves, turning the plant's defensive mechanism into a surface for ice nucleation. North from St.Petersburg, Russia

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Kannelyarvi north from Saint Petersburg, Russia, October 1, 2025

Album 3757: Kannelyarvi north from Saint Petersburg, Russia, October 1, 2025

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