What do you mean by four cold friends?

This word refers to plum, orchid, bamboo and chrysanthemum.

"Four Cold Friends" refers to animals and plants that live in four cold environments in winter. These four friends are bamboo, plum blossom, squirrel and egret. Different from the creatures represented by other seasons, it shows the unique beauty and charm of winter solar terms, and the four friends of the old and the cold are symbolic. These four plants still thrive in the cold winter, bringing people hope and courage.