Phenology is the biological response to the changing seasons. Day length, temperature, precipitation, and other factors drive leaf-out and leaf fall in trees. In order to avoid undergoing damage by putting their leaves out too early as winter transitions to spring, trees require a particular amount of sunlight each day before leaves can emerge. Similarly, when the hours of daylight begin to decrease with the onset of fall, trees withdrawal nutrients from their leaves, drop them and become dormant for the winter. Understanding phenology is important because climate change has already brought,...Read more >