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Yes. Cornus are deciduous so they drop their leaves in the Autumn.
Dogwood Winter
I have no idea can you answer it please
because they are deciduous.
No. Hemlocks(Tsuga) are evergreens,so they do not lose their foliage in winter.
I presume you mean leaves. All deciduous trees lose their leaves in winter.
It happens during winter
During Winter, after they have lost their leaves during Autumn.
Deciduous trees lose their leaves in WinterDeciduous trees lose there leaves in the Autum, most are gone by winter, they grow back during the Spring.deciduousPlants that shed their leaves shortly before winter to conserve energy are called deciduous.Trees that lose their leaves in the Winter are called Deciduous Trees.Deciduous trees are trees that lose their leaves in Winter.Evergreen, or coniferous.- these do NOT loose their leaves (needles) in the winter. Deciduous trees like maple, oak and hickory loose their leaves in the winter,
The tree is virtually hibernating and drops its leaves so that it may avoid freezing of free water in the leaves during winter season.
Because some of the nutrients of the leaves are pulled back into the plant.
Less leaves in winter is energetically favorable for any tree. Less availability of sunlight during the winter is one of the main cause to shed leaves. Trees can use their stored up energy for long time if they have less leaves, to get by harsh winter.