Why are willows always planted by the river?

Willow needs water and has good water resistance. When flooded, it can produce many adventitious roots floating in the water and exercise the function of absorbing and transporting nutrients, so willow is suitable for planting by the river. In addition, from the perspective of geomantic omen and folklore, there is a superstition that willow and pine trees are hidden houses and are not suitable for planting in the houses of the living.