De Natuurkalender

Extra attention

Hazel

Record your first flowering of hazel: Anonymus or With account

Click here for the species of which we would like you to record your sightings.

Observations per week

Map

Jan Dec

First flower First flower  

Logo De Natuurkalender

The Dutch phenological network with observations of yearly recurring life cycle events in nature since 1868.

The new website has been made possible by the Prins Bernhard Cultuurfonds and Wageningen University.