Ringed Bastard Toadflax Plant Care
Thesium annulatum A.W.Hill
Updated · Sources · How we source care data
Thesium annulatum is a unique plant known for its circular, ring-shaped leaves that are a vibrant shade of green. Its striking foliage and compact growth habit make it a standout choice for plant enthusiasts looking to add something different to their collection.
Every 7–10 days
Partial shade to full sun
60–75°F
50–70%
At a glance
How do you care for Ringed Bastard Toadflax?
Water Ringed Bastard Toadflax every 7–10 days, letting the top layer of soil dry out between waterings, and give it partial shade to full sun. It prefers temperatures of 60–75°F (16–24°C) and 50–70% humidity. Fertilize it every 2 months during the growing season.
What Is the Ringed Bastard Toadflax?
Ringed Bastard Toadflax (Thesium annulatum) belongs to the Santalaceae family within the Thesium genus. Ringed Bastard Toadflax is native to South Africa.
Ringed Bastard Toadflax displays a low-growing perennial herb growth habit, reaching up to 1 ft tall with a spread of approximately 1 ft. Ringed Bastard Toadflax produces small, inconspicuous flowers in clusters.
Leaf size: approximately 3 inches.
How Often Should You Water a Ringed Bastard Toadflax?
Thesium annulatum requires watering every 7–10 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 7–10 days
Let soil partially dry between waterings
What Light Does the Ringed Bastard Toadflax Need?
Ringed Bastard Toadflax thrives in partial shade to full sun.
Light Requirement
Partial shade to full sun
What Temperature and Humidity Does the Ringed Bastard Toadflax Prefer?
Thesium annulatum grows best at temperatures of 60–75°F. Ringed Bastard Toadflax prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
60–75°F
Humidity
50–70%
What Soil Mix Works Best for a Ringed Bastard Toadflax?
Well-draining sandy loam with added organic matter. Good drainage is essential for Ringed Bastard Toadflax to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Ringed Bastard Toadflax?
Feed Ringed Bastard Toadflax 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 Ringed Bastard Toadflax?
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 Ringed Bastard Toadflax?
Ringed Bastard Toadflax can be propagated through seeds, division of root clumps. Similar propagation techniques also apply to bastard toadflax plant care, which shares the same genus.
Is the Ringed Bastard Toadflax Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Ringed Bastard Toadflax, 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 Ringed Bastard Toadflax?
Ringed Bastard Toadflax is susceptible to aphids, spider mites, scale insects. 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
Ringed Bastard Toadflax 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 Thesium genus — compare its care with other Thesium species on PlantoScan.
Thesium is part of the Santalaceae plant family — browse all Santalaceae genera and species.
Ringed Bastard Toadflax thrives in bright light and direct sun — see other bright-light plants.
More Thesium Species
Other Thesium species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Thesium annulatum A.W.Hill, family Santalaceae (first published in Bull. Misc. Inform. Kew 1915: 23 (1915)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Ringed Bastard Toadflax, 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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