Willow seeds generally mature in April-May. The seeds are very small and have white fluff on them. Because they fly like catkins in the wind, they are called catkins.

Willow spreads seeds to far places to take root and sprout through flying catkins, as do poplar and dandelion.

There are many ways to spread plant seeds, such as autobiography, water transmission and bird transmission. One of them is spread by the wind.

Some seeds or fruits will grow hair or wing-like structures, which will float far away when the wind blows.