Phenological phases

Silver birch (Betula pendula Ehrh.)

Closed buds

The defined stage of leaf appearance

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

After the defined stages of leaf appearance

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

Photos: Eija Matikainen

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).

Photo: Teijo Nikkanen