I planted a Bay laurel (Laurus nobilis) in my garden in Sweden (60°8'33.86"N, 16°9'46.62"E). I am aware the climate here is not ideal for this tree, but I have hope it can adapt.
I planted in the summer of 2015 and this has happened since:
Summer 2015: Planted it from a small (baby tree). In the winter it dried out.
Summer 2016: It came up a new branch (I thought it had died!). The branch became around 60cm high, looking great. In the autumn a raindear ate its top leaves and in the winter it dried again.
Summer 2017: 3 branches came up, I put a fence (like this one) around it quite high so no animals reach it.
How can I make the branches survive over winter? (In Sweden there is quite litle light during winter and temperatures can drop to -25oC)
I thought about covering the small tree during the winter, should I cover just from snow, or close it more hermetic?