Gardening

They need sun when they have leaves because leaves create food from sunlight, water and minerals by photosynthesis. So sun is important to the tree only when it is using its leaves to feed itself. If you have direct sun for most of the day when the trees are not dormant they should be fine. I have apple trees that get full sun most of the day in the spring and summer (they are shaded most of the morning), and they produce apples with no trouble.