None known Plant Care
Vernonia ampandrandavensis Humbert
Updated · Sources · How we source care data
This plant's striking violet-colored leaves are its most distinctive feature, making it stand out in any garden. Originating from Madagascar, its rarity and unique appearance make it highly sought after by plant collectors looking to add something truly special to their collection.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for None known?
Water None known 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 60–80°F (16–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the None known Native To?
What Is the None known?
None known (Vernonia ampandrandavensis) belongs to the Asteraceae family within the Vernonia genus. None known is native to Madagascar.
None known displays an upright, bushy perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. None known produces small purple composite flowers in clusters.
Leaf size: approximately 6 inches.
How Often Should You Water a None known?
Vernonia ampandrandavensis 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 None known Need?
None known thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the None known Prefer?
Vernonia ampandrandavensis grows best at temperatures of 60–80°F. None known prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a None known?
Well-draining loamy soil with added compost for nutrients. Good drainage is essential for None known to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a None known?
Feed None known 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 None known?
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 None known?
None known can be propagated through seeds, division of root ball. Similar propagation techniques also apply to narrowleaf ironweed plant care, which shares the same genus.
Is the None known Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list None known, 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 None known?
None known is susceptible to aphids, spider mites, whiteflies. 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 None known Need?
None known grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. None known is native to Madagascar. In cooler regions, grow None known as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
None known 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 Vernonia genus — compare its care with other Vernonia species on PlantoScan.
Vernonia is part of the Asteraceae plant family — browse all Asteraceae genera and species.
None known thrives in bright light and direct sun — see other bright-light plants.
More Vernonia Species
Other Vernonia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Vernonia ampandrandavensis Humbert, family Asteraceae (first published in Notul. Syst. (Paris) 13: 318 (1949)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list None known, 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.
- Hardiness zone: USDA Zone 13a, 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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