What does catkin mean?

Catkin, the seeds of willow, has white fluff on it, dancing with the wind, like floating catkin, so it is called catkin.

Poplar, alias: Populus tomentosa, Populus tomentosa, Latin scientific name: Populus tomentosa, belonging to Salicaceae and Populus euphratica, with white wood and flat texture, can be used as building, furniture, box boards, matchsticks, paper making and other materials, and is the raw material of man-made fibers. Populus tomentosa has good material, fast growth, long life, good drought resistance and salt tolerance, magnificent tree posture and beautiful crown shape, and is an excellent landscaping or street tree that people everywhere like to plant. According to Compendium of Materia Medica, willow catkins have the functions of clearing away heat and toxic materials, benefiting the liver and improving eyesight. However, when the fruits of poplars are about to mature, poplars will fly everywhere when they crack. Poplar trees scattered everywhere in the street will cause environmental pollution and block people's respiratory tract. Therefore, street trees should be planted with male poplars, and female poplars are prohibited. That is, the seeds of poplars, which make poplars spread more widely.