Photo: Scott CaveCC BY 4.0via iNaturalistresized / cropped
Water-plantain Spearwort Plant Care
Ranunculus ambigens S.Watson
Updated · Sources · How we source care data
Ranunculus ambigens is known for its vibrant yellow flowers with delicate petals that resemble small suns. Originating from the Mediterranean region, this plant is highly sought after by collectors for its unique appearance and ability to brighten up any garden or landscape with its cheerful blooms.
Every 3–5 days
Full sun to partial shade
50–75°F
50–70%
At a glance
How do you care for Water-plantain Spearwort?
Water Water-plantain Spearwort every 3–5 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–75°F (10–24°C) and 50–70% humidity. Fertilize it every 2 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.
Where Is the Water-plantain Spearwort Native To?
What Is the Water-plantain Spearwort?
Water-plantain Spearwort (Ranunculus ambigens) belongs to the Ranunculaceae family within the Ranunculus genus. Water-plantain Spearwort is native to the eastern part of North America.
Water-plantain Spearwort displays a low rosette, clumping growth habit, reaching up to 1 ft tall with a spread of approximately 1 ft. Water-plantain Spearwort produces brightly colored, multi-petaled blooms in various shades.
Leaf size: approximately 4 inches.
How Often Should You Water a Water-plantain Spearwort?
Ranunculus ambigens requires watering every 3–5 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 3–5 days
Let soil partially dry between waterings
What Light Does the Water-plantain Spearwort Need?
Water-plantain Spearwort thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Water-plantain Spearwort Prefer?
Ranunculus ambigens grows best at temperatures of 50–75°F. Water-plantain Spearwort prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
50–75°F
Humidity
50–70%
What Soil Mix Works Best for a Water-plantain Spearwort?
Moist, well-draining soil with organic matter. Good drainage is essential for Water-plantain Spearwort to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Water-plantain Spearwort?
Feed Water-plantain Spearwort 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 Water-plantain Spearwort?
Divide and repot every 2-3 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 Water-plantain Spearwort?
Water-plantain Spearwort can be propagated through division, seeds. Similar propagation techniques also apply to western water buttercup plant care, which shares the same genus.
Is the Water-plantain Spearwort Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
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 Water-plantain Spearwort?
Water-plantain Spearwort is susceptible to aphids, slugs, snails. 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.
What USDA Hardiness Zone Does the Water-plantain Spearwort Need?
Water-plantain Spearwort grows outdoors in USDA Zone 5a – 9b. It survives winters down to planting zone 5a. Water-plantain Spearwort is native to the eastern part of North America.
Hardiness Zone
Zone 5a – 9b
Keep exploring plants
Water-plantain Spearwort 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 Ranunculus genus — compare its care with other Ranunculus species on PlantoScan.
Ranunculus is part of the Ranunculaceae plant family — browse all Ranunculaceae genera and species.
Water-plantain Spearwort thrives in bright light and direct sun — see other bright-light plants.
More Ranunculus Species
Other Ranunculus species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Ranunculus ambigens S.Watson, family Ranunculaceae (first published in Bibl. Index N. Amer. Bot. : 16 (1878)) — World Flora Online record, IPNI name record.
- Pet toxicity: Water-plantain Spearwort is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Scott Cave, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 5a – 9b, estimated from the plant's typical growing conditions.
- 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
Water-plantain Spearwort 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