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Video Highlight: final phase of the main grass pollination period 2025

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Many grasses in sunny locations in and around Vienna have already faded (Video ©Maximilian Bastl (MedUni Vienna/Pollenservice Vienna)). This year, the diversity of grass species is higher in the area around Vienna.

Here you can see flowering crested dogtail grass (Cynosurus cristatus) in the foreground and extensive meadows in the background, which have already exhausted most of their flowering potential.

Video Highlight: first pollination of the birch 2025

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The first birch trees reached its readiness to flower in Vienna in the week of March 24, 2025 and went into bloom shortly afterwards (Video ©Katharina Bastl (MedUni Vienna/Pollenservice Vienna)). Accordingly, pollen release takes place under favorable conditions.

Here you can see birch catkins that are already dusting in a macro video. Pollen is released into the air as yellowish dust when touched.

Video Highlight: flower of black alder 2025

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The black alder is flowering in Vienna. The majority of the catkins are in bloom and ready to dust, as can be clearly seen here in the macro video (©Katharina Bastl (MedUni Vienna/Pollenservice Vienna)).

The main pollination period of the black alder in Vienna usually extends from February to March. This year, the main flowering period began in calendar week 8.

Video Highlight: flower of hazel 2025

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The hazel flowers in Vienna. The pollen grains are too small for the naked eye and are only in the shape of a pollen cloud to see, as can be clearly observed here in the video (©Katharina Bastl (MedUni Vienna/Pollenservice Vienna)).

Pollen is only released when the catkins are in bloom. Each male catkin can contain millions of pollen grains (between 2 and up to 8 million depending on the reference).