These trees love water, and they have very thirsty roots. It is for this reason that they are so strongly associated with ponds and are often found growing near bodies of water. As a non-native species, it is quite possible that many weeping willows you have seen were deliberately planted, rather than propagating through natural means. They can be quite useful when it comes to strengthening shorelines, as their roots form extensive networks and may seem drawn to water like a magnet. This can help hold a sandy lakeside together and prevent it from being washed away into the water during storms.
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