Plants have evolved to sense and respond to changes in daylight as seasons shift, except those that grow at the equator, of course. Disrupting periods of darkness, such as by growing near streetlights that are on throughout the night, can affect a plant in a number of ways, but most are minimal if the plant is otherwise healthy. Are Streetlights Bad for Plants? The simple answer is yes. Deciduous green plants, particularly trees, measure light and detect when days are getting shorter and longer. This helps them decide when to go dormant in the fall and when to start to come out of dormancy in the spring. The effect of streetlights on plants and trees can disrupt this important process. In the fall, take notice of trees under street lamps. The leaves right under the light tend to stay green longer than the rest of the tree. This delayed senescence
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