Not a grass (Freshwater Algae)
Spirogyra spp. or similar filamentous green algae · Not applicable (Aquatic organism)
Grass Family
Not applicable (Zygnemataceae family)
Grass Category
Wetland/Riparian Algae
Variety / Cultivar
Not applicable
Hardiness Zones
Universal across all hardiness zones in suitable aquatic bodies.
About This Grass
Forms dense, slimy, bright green mats floating on or submerged in stagnant or slow-moving water, often referred to as pond scum.
Blade Characteristics
No true leaves, stems, or blades; consists of microscopic filamentous strands.
Root System
Rootless; absorbs nutrients directly through cell walls from the surrounding water.
Growing Information
Origin Region
Cosmopolitan, found worldwide in freshwater habitats
Growth Habit
Mat-forming, floating or submerged colonial organism
Sunlight & Water Needs
Requires direct sunlight for photosynthesis and entirely aquatic, freshwater environment.
Mowing & Maintenance
Not applicable; controlled mechanically by physical removal or biologically via aquatic herbivores and beneficial bacteria.
Special Characteristics
Rapidly proliferates in nutrient-rich (high nitrogen and phosphorus) warm water with abundant sunlight.
Ecological Information
Forms the base of aquatic food webs, provides oxygen via photosynthesis, but can cause hypoxia (oxygen depletion) if overabundant.