Grass-like in appearance with thin branching dark-green stems and alternate leaves with no prominent mid vein. It can grow up to 8 feet long and form floating islands. Flowers rise above the surface and are bright yellow, star-shaped, with 6 narrow petals. Flowers bloom in the morning and wilt in the evening.
Water stargrass reproduces from seeds and through fragmentation, preferring hard, alkaline waters. Leaves will often collect water deposits giving them a gritty texture.
Control with aquatic herbicides is best achieved on young plants before deposits build up on the leaves reducing herbicide uptake.