This could be from bright sunlight, wind, low temperatures, and especially frozen soil, as roots cannot siphon frozen water. Without photosynthesis, needles lose their green pigment and display their red, yellow, orange, and even purple pigments. So, here’s a few pointers on how to avoid both winter bronzing and death of your evergreens. The first step is to be sure your evergreens are watered thoroughly in the fall, just before the ground freezes. Lastly, about once a month, if the ground is dry and has thawed a bit, water your evergreens again.

Source: Daily Sun November 28, 2020 11:15 UTC