We invite you to join us in tracking the “green wave”—the flush of green that accompanies leaf-out—over the course of the spring season, as well as the spread of seasonal color across the country in the autumn.

Observations of these trees are of extra importance because they can help decision-makers develop forecast models and early warning systems for use in forest management and public health administration via pollen forecasting. In fact, researchers are already using data that have been reported for these species to validate models that predict how changes in climate will impact phenology of trees, and also to learn that deciduous trees may leaf out weeks earlier under climate warming.

Join us for this special campaign! Make it easy on yourself - choose that tree that you see every day, either the one in your yard or the one you pass each day. Observations from just one tree can help fill critical data gaps!