Hydrocharitaceae
Halophila tricostata
Halophila tricostata
Zones 4–9Sun Partial SunWater ModerateCare High
Tropical Plants · Native Plants · Seagrass · Marine · Aquatic · Saltwater · Tropical · Queensland · Underwater · Coastal
Pet-safeTropical
Currently out of stock everywhereStock updated 9/6/2026
Halophila tricostata is a rare marine seagrass native to Queensland, Australia, and is not suitable for conventional home cultivation. It requires full saltwater submersion, stable marine conditions, and filtered sunlight through shallow coastal waters. This species is best appreciated in its natural habitat and is not available through retail nurseries.
Growing conditions
The details behind the basics
- Daily light
- 4 hours
- Watering
- Fully aquatic; requires constant saltwater immersion · Continuously submerged in seawater
- Maintenance
- High
- Soil
- loam
- Soil pH
- 5.5–7
- Temperature
- -25°F to 85°F
- Cycle
- Perennial
- Propagation
- Seed
Hardiness
USDA 4b-9b
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Form & growth
Mature size and habit
- Mature height
- 12 in – 3 ft
- Spread
- 2 ft
- Spacing
- 6 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- No
- Foliage
- Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- Queensland
Sources: trefle
More Halophila
Related plants from the same genus
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No nursery lists Halophila tricostata right now.