Deciduous Pine Trees
Although most pine trees will keep their leaves in winter, there some deciduous species which will shed all or part of their needle leaves in cold season. Their needle leaves will turn to yellow and brown before falling off from the trees. There are a lot of reasons for a pine tree to drop their leaves. Apart from diseases, there are some other reasons like environmental stress, pests, root issue, drought soil etc.
As a native tree in America, Eastern larch is a famous deciduous conifer tree which can grow more than 80 feet in height. It has dense green fine foliage which is arranged like a spiral. The leaves will drop off in autumn when the weather is turning cold. It prefers full sunlight conditions with some moisture and well-drained soil types. They also like to grow slightly acidic soil and relatively cold climates.
Originated from China, dawn redwood is another deciduous conifer tree which can reach up to 100 feet in height when fully grown up. It is a fast-growing tree species and its branches will be extended horizontally. One of the interesting features of the dawn redwood trees is that both deciduous and evergreen branches are growing on stems together. The deciduous branches will fall off in autumn while the evergreen ones do not. They have green foliage which will turn to brown before dropping off from the tree. It prefers well-drained and slightly acidic soil conditions and adequate sunlight during the growth. You need to provide enough spaces for the growth of the tree if you are planning to grow it in your garden.
Image provided By Crusier (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons