What's the difference between plants in the south and plants in the north?

North China: There are many cold-tolerant plants, such as winter crops such as wheat, barley, oats and alfalfa, which can tolerate the cold of-12 degrees Celsius. Birch can endure the severe winter of MINUS 45 degrees Celsius. Cedar, which is common in the south, is also more cold-resistant: the water vapor is high, most plants evaporate quickly, and the root system is densely distributed (hope to adopt, original).