noun
General term for aquatic plants, including seaweed and algae, found in ponds, rivers, or the sea.
池の藻草が増えすぎて、魚が泳ぎにくそうだ。
The water plants in the pond have grown too much, making it hard for the fish to swim.
海岸に打ち上げられた藻草を集めて肥料にした。
We gathered the seaweed washed up on the shore and used it as fertilizer.