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Phenology Week! March 16-20, 2026
Tue, Feb 03, 2026
March 16-20, 2026 is Phenology Week - a virtual celebration of the seasonal cycles of plants and animals. The purpose of Phenology Week is to celebrate YOU, our Nature's Notebook observers, Local Phenology Programs, and partners! We'll have webinars, awards, daily challenges, observer stories, and more.
Phenology Week Media Kit
Check back on this page for our media kit.
Virtual Event Schedule
Check back on this page for our event schedule.
Spruce budworm affects more than just spruce trees
Fri, Jan 09, 2026
Insect pests, like emerald ash borers and spongy moths, pose a significant threat to forests in North America. Management of these pests depends on information about which trees are at greatest risk and which treatments are likely to be most effective. Outbreaks of spruce budworm can devastate fir and spruce forests in the northeastern U.S. and Canada, but the risk to other tree species has not been well documented. Researchers in Maine used Nature’s Notebook observations and tree ring data to show that spruce budworms also feed on eastern hemlock trees, which leaf out at the same time as fir and spruce trees. Understanding the risk to eastern hemlock trees is important because the trees play a unique role in eastern forests and are also harvested commercially.
Nature’s Notebook data reveal earlier spring activity under warmer conditions
Wed, Nov 05, 2025
Results from many small-scale studies have shown that warming temperatures are causing plants to leaf-out and flower earlier than they have in the past. However, it has been difficult to know whether these patterns hold true for a wide variety of plant species at a continental scale. To answer this question, researchers used thousands of observations of plants in the eastern U.S. that were submitted to Nature’s Notebook, mainly by volunteers. They found that leaf-out and flowering occurred earlier with warmer temperatures, but the effects varied among species and locations. Invasive species, shrub species, and species at southern latitudes were more sensitive to warming temperatures than other species. These patterns were similar to results from analyses of data collected by professionals and consistent with results from previous scientific studies, demonstrating the value of Nature’s Notebook observations.