Knotgrass (Paspalum distichum)
Care, watering, light and tips for Knotgrass on Floravia.
Quick facts
- Family: Poaceae
- Difficulty: Easy to care for
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
About Knotgrass
Paspalum distichum, commonly known as water finger-grass or knotgrass, is a perennial, creeping, stoloniferous grass forming dense green mats. Its stems can float in water or root in moist soils, with bright green, linear leaves. It's ideal for revegetating riverbanks, ponds, and wet areas, contributing a natural aesthetic and aiding in soil stabilization.
Native range
North and South America, Europe, Asia, and Africa
Care tips
It requires full sun to partial shade for optimal growth, though it tolerates some shade. Watering must be constant, keeping the substrate always moist or even submerged, as it is an aquatic or wetland plant. It prefers heavy, clayey or silty soils, rich in organic matter. A common mistake is planting it in dry soils or with insufficient watering, which will lead to its decline.
How to save a dying Knotgrass
- Warning signs
- Yellowish or brown, wilted, and weak leaves. Stunted or poor growth.
- First aid
- Check water level. Ensure direct sunlight and proper temperature. May need a gentle aquatic plant fertilizer.
- What kills it
- Prolonged drought (as an aquatic plant, it needs constant moisture or submersion). Lack of light. Water contamination.
- Can it be saved?
- Yes, if roots are still healthy and damage isn't extreme. Act quickly to restore ideal conditions.