Do trees go dormant in the winter?
Keeping this in view, do all plants go dormant in the winter?
Nearly all plants go dormant in winter—whether they're growing indoors or out in the garden. This period of rest is crucial to their survival in order to regrow each year. While plant dormancy during cold conditions is important, it may be equally important during times of stress.
In this regard, why do trees have no leaves in winter?
The first part of dormancy is when trees lose their leaves. They don't make food in the winter, so they have no use for masses of leaves that would require energy to maintain. The tree's metabolism also slows down during dormancy, and this is part of why cell growth is impeded.
To really be able to tell if your tree is dead or dormant is by checking the stems. You can check the stems by performing a “Scratch Test”. To do this, you'll need a smooth knife, a sharp pruning tool, or your fingernail depending on the shape and size of the tree.