In the wild, I think it grows in higher altitude mixed forest. (with oak, pine ect.). The mountain regions in the south/mediterranean area can get cold temperatues and snow and if that is where the laurel grows, it can probably tolerate colder temperatures than most people think. The soil in my terracotta pot is in most years, more or less frozen from december-march, even in the unheated greenhouse.
It is also important to note, that there is more than one cultivar/variety of bay laurel (Laurus nobilis). Their hardiness could vary.
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