Photo: Pierre Van EedenCC BY-SA 4.0via Wikimedia Commonsresized / cropped
Amazon Ironweed Plant Care
Vernonia colorata Drake
Updated · Sources · How we source care data
With its vibrant purplish leaves that stand out among other plants, Vernonia colorata originates from the tropical regions of Africa. This plant is highly sought after by collectors for its unique coloration and ability to attract butterflies and other pollinators to the garden.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Amazon Ironweed?
Water Amazon Ironweed 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 Amazon Ironweed Native To?
- Angola
- Benin
- Botswana
- Burkina Faso
- Burundi
- Cameroon
- Cape Verde
- Central African Republic
- Chad
- Côte d'Ivoire
- Djibouti
- DR Congo
- Equatorial Guinea
- Eritrea
- Eswatini
- Ethiopia
- Gabon
- Ghana
- Guinea
- Guinea-Bissau
- Kenya
- Lesotho
- Liberia
- Malawi
- Mali
- Mauritania
- Mozambique
- Namibia
- Niger
- Nigeria
- Republic of the Congo
- Rwanda
- Sao Tome and Principe
- Senegal
- Sierra Leone
- Somalia
- South Africa
- South Sudan
- Sudan
- Tanzania
- The Gambia
- Togo
- Uganda
- Zambia
- Zimbabwe
What Is the Amazon Ironweed?
Amazon Ironweed (Vernonia colorata) belongs to the Asteraceae family within the Vernonia genus. Amazon Ironweed is native to tropical and southern Africa. Amazon Ironweed is also known as Purple Vernonia, Eupatorium coloratum, Vernonia colorata.
Amazon Ironweed displays an upright, bushy perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Amazon Ironweed produces small purple composite flowers in clusters.
Leaf size: approximately 6 inches.
How Often Should You Water a Amazon Ironweed?
Vernonia colorata 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 Amazon Ironweed Need?
Amazon Ironweed thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Amazon Ironweed Prefer?
Vernonia colorata grows best at temperatures of 60–80°F. Amazon Ironweed prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Amazon Ironweed?
Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Amazon Ironweed to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Amazon Ironweed?
Feed Amazon Ironweed 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 Amazon Ironweed?
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 Amazon Ironweed?
Amazon Ironweed 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 Amazon Ironweed Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Amazon Ironweed, 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 Amazon Ironweed?
Amazon Ironweed 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 Amazon Ironweed Need?
Amazon Ironweed grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Amazon Ironweed is native to tropical and southern Africa. In cooler regions, grow Amazon Ironweed as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Amazon Ironweed 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.
Amazon Ironweed 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 colorata Drake, family Asteraceae (first published in Bull. Soc. Bot. France 46: 230 (1900)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Amazon Ironweed, 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: Pierre Van Eeden, CC BY-SA 4.0, Wikimedia Commons — original.
- 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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