Which plant can be beneficial in lake bottoms but becomes a nuisance when it grows to the surface?

The plant that can be beneficial in lake bottoms but becomes a nuisance when it grows to the surface is watermilfoil. This submerged aquatic plant can play a supportive role in the ecosystem by providing habitat and shelter for aquatic organisms at the bottom of lakes. However, when watermilfoil grows excessively and reaches the surface, it can form dense mats. These surface mats can hinder recreational activities such as swimming and boating and can also impact native species by outcompeting them for resources.

Other plants mentioned do have certain traits and impacts, but they do not specifically exhibit the characteristic of being beneficial when submerged and problematic when they reach the surface to the same extent as watermilfoil.