Annex > Phenological phases > Black alder

Phenological phases

Black alder (Alnus incana)

Leaf appearance

Closed buds

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The defined stage of leaf appearance

The buds have flushed and the green of the new leaves are clearly visible.

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After the defined stages of leaf appearance

The new leaves are unfolded and the leaf blade is fully visible.

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Photos: Eija Matikainen

Flowering in black alder

The flowers of male (staminate) inflorescence (hanging catkins) are open and begin to release yellow pollen.

(On windy days the release of pollen is visible).

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Photos: Eija Matikainen / Egbert Beuker