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The catkins of hornbeam release pollen which becomes visible here as a pollen cloud (video ©Katharina Bastl (MedUni Vienna/Pollenservice Vienna), calendar week 12).

Hornbeam flowers usually from mid of March until mid of May. This plant is called Carpinus scientifically and it belongs to the birch family. The allergen is very similar to the birch allergen due to this close taxonomic relationship, which may cause a cross-allergy for those with a birch pollen allergy.

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Trees of the yew and cypress family are currently flowering intensively, as can be seen in the video (©Katharina Bastl and Karen Kölzer (MedUni Vienna/Pollen Service Vienna)).

They are considered rare allergens in Austria, with cypress trees classified as more allergenic than yews. Their pollen cannot be distinguished under a light microscope.

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Despite the cold weather, the purple alder is already in full flower in Vienna. Most of the catkins are open and ready to release pollen, as can be clearly seen here in the video (©Katharina Bastl (MedUni Vienna/Pollen Service Vienna)).

The purple alder usually begins to flower during Christmas week. Due to its hybridization between Japanese and Caucasian alder, the tree copes well with lower temperatures and can release pollen even at just above 0°C.