If you’re experiencing some browning of your evergreens, it is most likely what is called, needle shedding. Needle shedding is normal for evergreen trees and shrubs and is not a sign of disease or insect infestation. Many evergreen trees have needle drop because they hold their needles for only a relatively short amount of time. In fact, Eastern White Pine trees only hold their needles for 2 years before shedding them and making way for new growth.