fallen yellow leaf of the black poplar, populus nigra, with petiole on the snow. copy space

autumn black blue botanic botanical calendar closeup cold cool copy covered crystal day detail fall fallen foliage forest freeze frost frosted frosty frozen garden hoarfrost ice icy leaf loneliness macro natural nature nigra north pale park pattern petiole plant poplar populus red season seasonal silence single snow solitude space textured vivid weather white winter yellow