Phenological phases
European beech (Fagus silvatica L.)
Leaf appearance
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: Erwin Ulrich
Flowering
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).
Male flowering
Photo: Robert Bruegger
Female flowering
Photo: Robert Bruegger
Autumn colouring in European beech
Leaves have changed their colour from green to yellow, yellow-brown or red-brown. Often single leaves are only partly autumn coloured. The estimation on autumn colouring refers to the whole leaf area of the tree, including the leaves that have already fallen down during the colouring period, in relation to the state before colouring starts.
Autumn colouration
Photo: Astrid Vasella