Why do few plants grow in a swift flowing mountain steam?

Few plants grow in a swift-flowing mountain stream due to the harsh environmental conditions, including strong water currents that can uproot or damage delicate roots. Additionally, the constant movement of water limits the accumulation of silt and nutrients, making it difficult for plants to establish themselves. The temperature fluctuations and increased turbulence can also create an inhospitable habitat for many species. As a result, only specialized plants adapted to such conditions can thrive in these environments.