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Syringodium filiforme

Syringodium filiforme · Cymodoceaceae

The gardener's calendar

The right move for September

Ideal time to plant syringodium filiforme: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Common name
Needle grass, Threadleaf seagrass
Family
Cymodoceaceae
Type
Submerged marine aquatic plant
Natural habitat
Tropical and subtropical coastal waters
Depth
0.5 to 8 meters
Growth
Moderate to slow
Origin
Western Atlantic, Caribbean, Gulf of Mexico

Care

Light and exposure

Syringodium filiforme requires clear, well-lit water to thrive, ideally in shallow coastal areas exposed to natural light. In an aquarium, provide a location receiving at least 8 to 10 hours of light daily. This sun-loving marine plant declines in overly dark or turbid environments.

Substrate and water conditions

This seagrass roots in sandy and muddy bottoms typical of coastal seagrass beds. In a tank, use fine sand or soft gravel substrate to facilitate rhizome anchorage. Maintain salinity close to natural seawater (1.020-1.025) and temperatures between 20 and 28 °C depending on the origin.

Water circulation and renewal

Gentle and consistent water circulation is essential to deliver nutrients and oxygen. Avoid strong currents that can damage the fine, filiform leaves. Ensure gradual water renewal to maintain physicochemical quality and limit pollutant accumulation.

Nutritional inputs

Syringodium filiforme feeds mainly through its roots and by foliar absorption of nutrients dissolved in the water. In a closed tank or aquarium, supplementation with micronutrients (iron, potassium) and trace elements promotes growth. Natural seagrass beds benefit from sediment inputs and biological mineralization.

Pests and deterioration

This species can be affected by eutrophication (excess nutrients favoring competing algae) and excessive sedimentation. Water that is too turbid or has excessive organic load slows its development. Regularly inspect for deposits or biofouling on leaves that could block photosynthesis.

Did you know?

Syringodium filiforme is one of only three Syringodium species in the world and plays a major ecological role in tropical seagrass beds: its fine, densely-arranged leaves provide shelter and food for countless small fish and invertebrates, while its rhizomes stabilize sandy bottoms against coastal erosion.

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.