Photo: National Geographic Okavango Wilderness ProjectCC BY 4.0via iNaturalistresized / cropped
Spiny Ottelia Plant Care
Ottelia muricata (C.H.Wright) Dandy
Updated · Sources · How we source care data
This aquatic plant is easily identified by its striking long, narrow leaves that can grow up to 40 cm in length. Originating from Australia, Ottelia muricata is highly sought after by plant collectors for its unique appearance and ability to thrive in both freshwater and brackish water environments. Its delicate white flowers add to its desirability among aquatic plant enthusiasts.
Every 7–14 days
Full sun to partial shade
70–85°F
60–80%
At a glance
How do you care for Spiny Ottelia?
Water Spiny Ottelia every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 70–85°F (21–29°C) and 60–80% humidity. Fertilize it every 2 months during the growing season.
Where Is the Spiny Ottelia Native To?
What Is the Spiny Ottelia?
Spiny Ottelia (Ottelia muricata) belongs to the Hydrocharitaceae family within the Ottelia genus. Spiny Ottelia is native to central and southern Africa. Spiny Ottelia is also known as Sharp-edged Ottelia.
Spiny Ottelia displays a submerged aquatic plant growth habit, reaching up to 1 ft tall with a spread of approximately 2 ft. Spiny Ottelia produces small inconspicuous flowers on the water's surface.
Leaf size: approximately 6 inches.
How Often Should You Water a Spiny Ottelia?
Ottelia muricata requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Spiny Ottelia Need?
Spiny Ottelia thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Spiny Ottelia Prefer?
Ottelia muricata grows best at temperatures of 70–85°F. Spiny Ottelia prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
70–85°F
Humidity
60–80%
What Soil Mix Works Best for a Spiny Ottelia?
Loamy soil with high organic content, well-draining. Good drainage is essential for Spiny Ottelia to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Spiny Ottelia?
Feed Spiny Ottelia every 2 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 2 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Spiny Ottelia?
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 Spiny Ottelia?
Spiny Ottelia can be propagated through division, seeds. Similar propagation techniques also apply to water-lettuce plant care, which shares the same genus.
Is the Spiny Ottelia Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Spiny Ottelia, 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 Spiny Ottelia?
Spiny Ottelia 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
Spiny Ottelia 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 Ottelia genus — compare its care with other Ottelia species on PlantoScan.
Ottelia is part of the Hydrocharitaceae plant family — browse all Hydrocharitaceae genera and species.
Spiny Ottelia thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Ottelia muricata (C.H.Wright) Dandy, family Hydrocharitaceae (first published in J. Bot. 72: 138 (1934)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Spiny Ottelia, 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.
- Photo: National Geographic Okavango Wilderness Project, CC BY 4.0, iNaturalist — original.
- 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.
Identify Plants Like the
Spiny Ottelia Instantly
Scan any plant with your phone camera and get instant ID, care tips, water and fertilizer reminders, and health checks — all in one app.
Free
to download
iOS & Android
platforms
Light & dark
mode
100,000+
species