Cymodocea
Cymodocea rotundata · Cymodoceaceae
The gardener's calendar
Ideal time to plant cymodocea: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Roundleaf seagrass
- Family
- Cymodoceaceae
- Type
- Marine aquatic plant
- Foliage
- Evergreen
- Natural habitat
- Tropical and subtropical coastal zones (Indian Ocean, Pacific)
- Depth
- 0.5 to 8 meters
- Growth
- Moderate
- Required salinity
- Saltwater or brackish water
Care
Light and exposure
Cymodocea rotundata requires direct exposure to natural light, ideally in shallow areas. It tolerates variations in brightness but develops best with clear, well-lit water. In an aquarium, use lighting adapted to the marine spectrum for at least 8 to 10 hours per day.
Water conditions
This plant lives entirely submerged in marine or brackish environments. Maintain stable salinity, close to that of natural seawater (30-35 ppt). Moderate water movements (gentle currents) promote its development without stressing the plant.
Substrate and rooting
Cymodocea rotundata roots in fine marine sediments (sand, silt). In controlled settings, use a sandy or silty substrate enriched with organic matter. Let the plant form its root system naturally without excessive intervention.
Nutrition
In its natural environment, this seagrass draws nutrients from seawater. In captivity, regularly add marine minerals and trace elements to compensate for deficiencies. Iron and other micronutrient inputs support foliage growth.
Health and prevention
Cymodocea rotundata is relatively resistant to disease if salinity and light conditions are correct. Water that is too turbid or unstable salinity can promote unwanted algae. Maintain good water circulation and avoid accumulation of organic debris.
Did you know?
Cymodocea rotundata is one of the seagrasses that populate tropical underwater meadows, critical ecosystems that shelter fish, crustaceans, and mollusks. These seagrass meadows sequester carbon 40 times faster than terrestrial forests, playing a major role in regulating ocean climate.
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.