Sea Hyssop Plant Care
Halophila ovalis (R.Br.) Hook.f.
Updated · Sources · How we source care data
Halophila ovalis, commonly known as paddle weed, spoon grass or dugong grass, is a seagrass in the family Hydrocharitaceae. It is a small herbaceous plant that naturally occurs in sea beds and other saltwater environments in the Indo-Pacific.
Full sun to partial shade
At a glance
How do you care for Sea Hyssop?
Sea Hyssop grows best in full sun to partial shade.
What Is the Sea Hyssop?
Sea Hyssop (Halophila ovalis) belongs to the Hydrocharitaceae family within the Halophila genus. Sea Hyssop is also known as Paddle Weed.
Sea Hyssop displays a spreading aquatic perennial growth habit, reaching up to tall with a spread of approximately . Sea Hyssop produces small inconspicuous flowers underwater.
What Light Does the Sea Hyssop Need?
Sea Hyssop thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Soil Mix Works Best for a Sea Hyssop?
Sandy, well-draining aquatic substrate with high organic content. Good drainage is essential for Sea Hyssop to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Sea Hyssop?
Repot every 1-2 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Sea Hyssop?
Sea Hyssop can be propagated through vegetative propagation, division, rhizome cuttings. Similar propagation techniques also apply to heart-shaped seagrass plant care, which shares the same genus.
Is the Sea Hyssop Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Sea Hyssop, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Sea Hyssop?
Sea Hyssop is susceptible to algae, aquatic weeds. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
Keep exploring plants
Sea Hyssop is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Halophila genus — compare its care with other Halophila species on PlantoScan.
Halophila is part of the Hydrocharitaceae plant family — browse all Hydrocharitaceae genera and species.
Sea Hyssop thrives in bright light and direct sun — see other bright-light plants.
More Halophila Species
Other Halophila species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Halophila ovalis (R.Br.) Hook.f., family Hydrocharitaceae (first published in Fl. Tasman. 2: 45 (1858)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Sea Hyssop, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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