Photo: User:Stan ShebsCC BY-SA 3.0via Wikimedia Commonsresized / cropped
Threadleaf Ragwort Plant Care
Senecio flaccidus Less.
Updated · Sources · How we source care data
Senecio longilobus Benth Senecio filifolius (L.) Hook. Senecio douglasii DC. Senecio monoensis Greene
Every 7–14 days
Bright indirect light to full sun
50–80°F
40–60%
At a glance
How do you care for Threadleaf Ragwort?
Water Threadleaf Ragwort every 7–14 days, letting the top layer of soil dry out between waterings, and give it bright indirect light to full sun. It prefers temperatures of 50–80°F (10–27°C) and 40–60% humidity. Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.
What Is the Threadleaf Ragwort?
Threadleaf Ragwort (Senecio flaccidus) belongs to the Asteraceae family within the Senecio genus. Threadleaf Ragwort is also known as Threadleaf Groundsel, Threadleaf Senecio, Senecio douglasii.
Threadleaf Ragwort displays an upright, trailing, or clumping habit growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Threadleaf Ragwort produces small, daisy-like flowers in various colors.
Leaf size: approximately 3 inches.
How Often Should You Water a Threadleaf Ragwort?
Senecio flaccidus 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 Threadleaf Ragwort Need?
Threadleaf Ragwort thrives in bright indirect light to full sun. Avoid placing Threadleaf Ragwort in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect light to full sun
What Temperature and Humidity Does the Threadleaf Ragwort Prefer?
Senecio flaccidus grows best at temperatures of 50–80°F. Threadleaf Ragwort prefers humidity levels of 40–60%.
Temperature
50–80°F
Humidity
40–60%
What Soil Mix Works Best for a Threadleaf Ragwort?
Well-draining sandy soil mix with added perlite for extra drainage. Good drainage is essential for Threadleaf Ragwort to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Threadleaf Ragwort?
Feed Threadleaf Ragwort every 6 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 6 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 Threadleaf Ragwort?
Repot every 1-2 years in 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 Threadleaf Ragwort?
Threadleaf Ragwort can be propagated through stem cuttings, division, seeds. Similar propagation techniques also apply to adenotrichia amplexicaulis plant care, which shares the same genus.
Is the Threadleaf Ragwort 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 Threadleaf Ragwort?
Threadleaf Ragwort is susceptible to aphids, spider mites, mealybugs. 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 Threadleaf Ragwort Need?
Threadleaf Ragwort grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Threadleaf Ragwort as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Threadleaf Ragwort 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 Senecio genus — compare its care with other Senecio species on PlantoScan.
Senecio is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Threadleaf Ragwort thrives in bright light and direct sun — see other bright-light plants.
More Senecio Species
Other Senecio species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Senecio flaccidus Less., family Asteraceae (first published in Linnaea 5(1): 161 (-162) (1830)) — World Flora Online record, IPNI name record.
- Pet toxicity: Threadleaf Ragwort 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: User:Stan Shebs, CC BY-SA 3.0, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- 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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