Is it true in a boreal forest biome many trees shed their leaves and grow new ones each year?

No, it's not true for most trees in boreal forests. The predominant trees in this biome, such as conifers like spruce and fir, are evergreen and retain their needles year-round instead of shedding leaves annually. However, some deciduous species, like birch and aspen, do lose their leaves in the fall and regrow them in the spring, but they are less common compared to the evergreen trees.