Photosynthesis in Pine Trees. Pine trees are evergreens. They keep their thin leaves, usually call needles, year-round. Like smaller plants, pine trees are self. What happens to plants in winter?. As winter approaches, deciduous trees transfer nutrients from the leaves into the branches where. Photosynthesis slows. Question about photosynthesis, trees, and winter?? I am a third grade teacher and we are currently studying plants. We were. In places where it gets cold in winter, deciduous plants give up on photosynthesis, dump their leaves and go dormant. Evergreens retain their leaves. Do they Trees must have adaptations to survive the cold and drying conditions of winter. Trees cannot change their location or behavior like animals can, so they must rely. A Comparison of the Photosynthesis Rates between Deciduous Leaves and Coniferous Needles. Matt Murray, Allison Boynick. CU Boulder, Fall 2004 For this experiment, the. When all the leaves fall off trees, how do the plants get energy other than from water? Doesn't the chlorophyll make photosynthesis from the leaves? Photosynthesis: How do we get oxygen in winter when trees don't have leaves and there's no sunshine? How Plants Prepare for Winter Photosynthesis. When we think of leaves in winter, we usually imagine them as dead or dying, having faded to fire colors during the. Also, evergreens are able to conduct photosynthesis in winter because the cells in the needles are protected by a type of self-made antifreeze that is.