male hazel catkins of the corkscrew hazel corylus avellana contorta in spring. germany, europe

allergen allergenic allergic allergy avellana biology bloom blooming blossom blossoming botanical botany bush catkins closeup colorful contorta cork corkscrew corylus decorated detail easter efflorescence efflorescent eggs europe european flora flourish flourishing flower flowering flowers germany hazel hazelnut horizontal male nature nuts plant puller season seasonal shrub shrubbery spring time tree twig vegetation yellow