Marine naiad (Najas marina)
Care, watering, light and tips for Marine naiad on Floravia.
Quick facts
- Family: Hydrocharitaceae
- Difficulty: Moderate care
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
About Marine naiad
Najas marina, also known as spiny naiad or stiff mermaid grass, is a submerged aquatic plant that forms dense underwater meadows. Its slender stems and fine, toothed leaves give it a delicate appearance, ideal for ponds, brackish water aquariums, or coastal wetland restorations. It adds a natural touch and provides shelter for aquatic fauna.
Native range
Cosmopolitan in temperate and tropical regions
Care tips
It requires direct or very bright sunlight for optimal growth, adapting to variable salinity conditions, from fresh to brackish water. The ideal substrate is sandy or silty, nutrient-rich, securely anchoring the roots. Ensure good water quality, with adequate CO2 and nutrient levels to prevent algal growth. Avoid sudden changes in water salinity or temperature, as this can stress the plant.
How to save a dying Marine naiad
- Warning signs
- Pale or transparent leaves, soft stems, decomposition. As an aquatic plant, any water change is critical.
- First aid
- Check water quality: pH (6.5-8.5), hardness, and nutrients. If water is stagnant or dirty, perform a partial water change.
- What kills it
- Water pollution (heavy metals, pesticides), lack of light, or excess nutrients causing algae blooms.
- Can it be saved?
- Yes, if you act fast. A water change and parameter adjustment can revive it if not completely decomposed.