First Day Of Spring

The project engages volunteers in recording plant observations on 21 March, the first day of the calendar spring, to document the phenological status of selected plant species across different locations.

Depending on the project edition, the dataset includes either information on phenological stages or quantitative measurements such as the number of buds, flowers, leaves, or fruits. These measurements are provided through the MeasurementOrFact extension of the Darwin Core Archive. The 2021 edition of the project was conducted using the iNaturalist platform.