Different sources: Poplar catkins grow from poplars and belong to the seeds of poplars. Poplar flowers will fly out when they mature and crack. Yang Shuhua has no dense glands and cannot secrete nectar to induce insects to spread pollen. They can only spread pollen by wind and belong to wind-borne flowers. Catkin is grown from willow. Although similar, they come from different sources. It is the seed of willow. Willow is a unisexual flower with no perianth, but nectar, which can attract insects to spread pollen by nectar and belongs to insect-borne flowers.
The appearance time is different: catkins usually appear first and last for a week. Catkin will appear later, usually after poplar catkins.
Different texture: Poplar flocs are more cohesive, can agglomerate and feel like cotton. Catkin fiber is relatively slender, relatively dispersed and soft.
Different propagation distances: catkins are mostly clustered, heavier and have shorter propagation distances. Catkin is lighter and can float farther with the wind.