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overview of the early bloomers: common hazel, Turkish hazel and grey alder with flowering catkins, black alder with closed catkins

Hazel (common hazel: upper left and Turkish hazel: lower left) flower.
Grey alder (lower right) has started to flower.
Black alder (upper right) has made a development boost, but not yet reached the readiness to flower.

#pollenforecast at the #PollenserviceVienna MedUni Wien