Photo: PrateekCC BY-SA 2.5 invia Wikimedia Commonsresized / cropped
Cotton Thistle Plant Care
Saussurea gossypiphora Franch.
Updated · Sources · How we source care data
This plant's thick, woolly leaves set it apart with their silvery appearance. Originally from the Himalayas, Saussurea gossypiphora's rarity and unique beauty make it a coveted addition to any plant collector's garden.
Every 7–10 days
Full sun to partial shade
50–75°F
40–60%
At a glance
How do you care for Cotton Thistle?
Water Cotton Thistle every 7–10 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 40–60% humidity. Fertilize it every 6 months during the growing season.
What Is the Cotton Thistle?
Cotton Thistle (Saussurea gossypiphora) belongs to the Asteraceae family within the Saussurea genus. Cotton Thistle is native to the Himalayas, and found at altitudes of 4300–5600 m. Cotton Thistle is also known as Saussurea gossypiphora.
Cotton Thistle displays a clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Cotton Thistle produces large, showy purple composite flowers.
Leaf size: approximately 12 inches.
How Often Should You Water a Cotton Thistle?
Saussurea gossypiphora 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 Cotton Thistle Need?
Cotton Thistle thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Cotton Thistle Prefer?
Saussurea gossypiphora grows best at temperatures of 50–75°F. Cotton Thistle prefers humidity levels of 40–60%.
Temperature
50–75°F
Humidity
40–60%
What Soil Mix Works Best for a Cotton Thistle?
Well-draining sandy loam with added organic matter. Good drainage is essential for Cotton Thistle to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Cotton Thistle?
Feed Cotton Thistle 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 Cotton Thistle?
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 Cotton Thistle?
Cotton Thistle can be propagated through seeds, division. Similar propagation techniques also apply to alpine saw-wort plant care, which shares the same genus.
Is the Cotton Thistle Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Cotton Thistle, 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 Cotton Thistle?
Cotton Thistle 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 Cotton Thistle Need?
Cotton Thistle grows outdoors in USDA Zone 3a – 6b. It survives winters down to planting zone 3a. Cotton Thistle is native to the Himalayas, and found at altitudes of 4300–5600 m.
Hardiness Zone
Zone 3a – 6b
Keep exploring plants
Cotton Thistle 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 Saussurea genus — compare its care with other Saussurea species on PlantoScan.
Saussurea is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Cotton Thistle thrives in bright light and direct sun — see other bright-light plants.
More Saussurea Species
Other Saussurea species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Saussurea gossypiphora Franch., family Asteraceae (first published in Journal de Botanique (Morot) 2(20): 359 1888) — World Flora Online record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Cotton Thistle, 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: Prateek, CC BY-SA 2.5 in, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 3a – 6b, 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.
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