Najas marina
Najas marina · Hydrocharitaceae
The gardener's calendar
Ideal time to plant najas marina: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Scientific name
- Najas marina
- Family
- Hydrocharitaceae
- Type
- Submerged aquatic plant
- Origin
- Temperate and tropical regions of Eurasia and Africa
- Growth
- Fast
- Hardiness
- Moderate (0 to 15 °C depending on populations)
- Foliage
- Deciduous to semi-evergreen depending on climate
Care
Light and exposure
Naiad thrives in full light, ideally 6 to 8 hours per day for optimal growth. It tolerates partial shade but its density decreases. Place it in a well-lit zone of your pond or aquarium to maximize photosynthesis and vitality.
Water conditions
Fully aquatic plant that lives submerged in fresh water preferably. It adapts to various depths (10 to 100 cm) and tolerates slightly brackish water. Ensure slight water movement or circulation to avoid complete stagnation.
Substrate and anchoring
It grows freely in open water or anchors itself in a muddy, nutrient-rich substrate. A mix of fine sand and peat promotes rooting. Depending on use (natural pond or aquarium tank), a nutrient-rich substrate facilitates establishment of fine roots.
Nutrition and fertilization
Benefits from micro and macronutrient supply, particularly nitrogen and potassium. Regular dosed aquatic liquid fertilizer supports rapid growth. In natural ponds, nutrients from organic debris often suffice.
Pruning and control
Cut stems regularly to control proliferation and encourage bushy form. Its growth can become invasive under optimal conditions: harvest excess portions. Cut back bare or rotted parts.
Pests and problems
Generally robust, it may suffer from overly polluted or stagnant water. Water rabbits and certain herbivorous fish browse on it. Well-oxygenated water and good circulation limit rot and competing filamentous algae.
Did you know?
Naiad is an excellent ecological indicator of temperate fresh waters: its presence signals good quality, low-pollution water. In hydrobiology, this plant serves as shelter and food for aquatic organisms. It was also historically used as aquatic forage in certain Central Asian regions.
Where to buy it
Best planted in spring or autumn, away from frost and heatwaves. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September, October.
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Tips generated and checked by Viridia — adapt them to your local climate.