first signs of spring. hazel, european filbert corylus avellana opened flower buds and catkins on the eve of spring

spring hazel filbert catkins flower nature tree hazelnut season plant garden forest corylus branch avellana bloom yellow pollen closeup environment bright nut bush macro grove plantation sky blooming nuttree blue natural wildlife springtime blossom flora outdoor twig catkin allergy fagales summer bunch wood leaf green eco foliage tasty seeds first signs spring european opened buds eve