De Natuurkalender

Extra attention


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


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.