Outdoor Winter grow

The ladies are chugging along just fine, some stretch and pre flower is in full swing. The night's her really cold and humid which is no good in flower. But they are still going strong. Can you breed cold hardiness into cannabis? Maybe I can use these ladies to breed..... I rotated the greenhouse to allow for direct sunlight for a longer time. They are just getting molasses in their water and the Dr earth mixed into the soil. They seem to be doing fine but there hasn't been any rain yet so we'll see what the next week's bring