Photo: Kumar AppaiahCC BY-SA 2.0via Wikimedia Commonsresized / cropped
Green-thread Plant Care
Thelesperma filifolium (Hook.) A.Gray
Updated · Sources · How we source care data
Coreopsis filifolia Hook.
Every 7–10 days
Full sun
50–85°F
30–60%
At a glance
How do you care for Green-thread?
Water Green-thread every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 50–85°F (10–29°C) and 30–60% humidity. Fertilize it every 6 months during the growing season.
What Is the Green-thread?
Green-thread (Thelesperma filifolium) belongs to the Asteraceae family within the Thelesperma genus. Green-thread is also known as Cosmos, Coreopsis filifolia, Coreopsis trifida.
Green-thread displays a low-growing perennial growth habit, reaching up to 0.5 ft tall with a spread of approximately 1 ft. Green-thread produces bright yellow daisy-like flowers.
Leaf size: approximately 2 inches.
How Often Should You Water a Green-thread?
Thelesperma filifolium 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 Green-thread Need?
Green-thread thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Green-thread Prefer?
Thelesperma filifolium grows best at temperatures of 50–85°F. Green-thread prefers humidity levels of 30–60%.
Temperature
50–85°F
Humidity
30–60%
What Soil Mix Works Best for a Green-thread?
Well-draining sandy soil with some organic matter. Good drainage is essential for Green-thread to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Green-thread?
Feed Green-thread 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 Green-thread?
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 Green-thread?
Green-thread can be propagated through seeds. Similar propagation techniques also apply to long-stalked greenthumb plant care, which shares the same genus.
Is the Green-thread Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Green-thread, 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 Green-thread?
Green-thread is susceptible to aphids, spider mites. 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 Green-thread Need?
Green-thread grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Green-thread as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Green-thread 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 Thelesperma genus — compare its care with other Thelesperma species on PlantoScan.
Thelesperma is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Green-thread 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: Thelesperma filifolium (Hook.) A.Gray, family Asteraceae (first published in Hooker's J. Bot. Kew Gard. Misc. 1[8]: 252. 1849 [Aug 1849]) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Green-thread, 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: Kumar Appaiah, CC BY-SA 2.0, 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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