Hydrocharitaceae
Turtle grass: Ground Cover Plant
Thalassia testudinum
Turtle grass is not cultivated as an indoor plant. In its natural habitat, it thrives fully submerged in shallow seawater (up to about 10 m deep), with high light intensity, salinity between 20 and 38.5 ppt (ideally 25-35), and temperatures between 20 and 30°C. It reproduces primarily by vegetative expansion of the rhizome, forming extensive clonal colonies; sexual reproduction occurs between April and July, with greenish to slightly pinkish flowers pollinated by water and small crustaceans.
Every 7-10 days
Bright indirect
20° - 30°C
% - %
Categories
What is Turtle grass?
Turtle grass (Thalassia testudinum) is a hard-care plant from the Hydrocharitaceae family. Turtle grass is a flowering marine plant (angiosperm) of the Hydrocharitaceae family, forming extensive submerged 'meadows' on shallow sandy and calcareous bottoms of the Caribbean and the Gulf of Mexico. Its long, dark-green, ribbon-like leaves grow from a long, jointed rhizome buried 5 to 25 cm de...
Turtle grass grows up to 35cm, 20°C â 30°C. It is not suitable for indoor environments and safe for pets.
Unlike easy-care plants, Turtle grass demands constant attention to humidity and light. Not recommended for beginners. Unlike many popular species, Turtle grass is safe to keep around pets.
How to Care for Turtle grass?
TLDR: Turtle grass needs Bright indirect, watering every 7 days, and temperatures between 20-30°C with 40-70% humidity.
How Much Light Does Turtle grass Need?
Requires intense and constant sunlight â it is considered a 'climax' species among seagrasses, demanding more than 18% of surface irradiance to maintain a positive carbon balance. Turbid or excessively deep waters limit its distribution.
What Is the Best Soil for Turtle grass?
It roots in coarse to muddy sand bottoms, with calcareous content, in calm, low-turbidity lagoons. The rhizome can penetrate 5 to 25 cm deep into the sediment.
What Is Turtle grass and Where Does It Come From?
Turtle grass is a flowering marine plant (angiosperm) of the Hydrocharitaceae family, forming extensive submerged 'meadows' on shallow sandy and calcareous bottoms of the Caribbean and the Gulf of Mexico. Its long, dark-green, ribbon-like leaves grow from a long, jointed rhizome buried 5 to 25 cm deep in the substrate. It is the dominant seagrass species in much of the region, supporting an entire ecosystem: green sea turtles, parrotfish, surgeonfish, and sea urchins feed directly on it, while its leaves host a film of epiphytes (algae, diatoms, and bacteria) that feeds countless invertebrates. It is not a conventional aquarium or home garden plant â it depends on saltwater, high light, and constant submersion.
How Big Does Turtle grass Grow?
TLDR: Turtle grass can reach up to 35cm tall with Fast growth rate.
Max height
35cm
Growth rate
Fast
Foliage
Evergreen
Plant Uses
Ground Cover
Soil coverage
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Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Creeping bentgrass | Hard | Direct sun | 3d | â |
| Crystal Anthurium | Hard | Partial shade | 7d | â ïļ |
| Saguaro | Hard | Direct sun | 21d | â |
| Lisianthus | Hard | Bright indirect | 7d | â |
