Help! Drought Resistant Evergreen Plants suitable for pots in Shady Courtyard!

Hi Everyone

I have a shady courtyard in the garden, and would like to put some pots plants in it; but Im not around a lot so they would need to be drought resistant and be able to survive -10C. The courtyard does get some sun, and of course it rains in France, but wondered about plants that would like these conditions. Any help appreciated.