Photo: FabPublic domainvia Wikimedia Commons
Heartleaf Ragweed Plant Care
Ambrosia cordifolia (A.Gray) W.W.Payne
Updated · Sources · How we source care data
This plant's heart-shaped leaves are its most distinctive visual feature, making it easily recognizable. Originating from North America, Ambrosia cordifolia is highly sought after by plant collectors for its unique foliage and ability to attract pollinators to the garden.
Every 3–5 days
Full sun to partial shade
60–80°F
40–60%
At a glance
How do you care for Heartleaf Ragweed?
Water Heartleaf Ragweed every 3–5 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 40–60% 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.
Where Is the Heartleaf Ragweed Native To?
What Is the Heartleaf Ragweed?
Heartleaf Ragweed (Ambrosia cordifolia) belongs to the Asteraceae family within the Ambrosia genus. Heartleaf Ragweed is native to northern Mexico and the State of Arizona in the United States. Heartleaf Ragweed is also known as Franseria cordifolia, Gaertneria cordifolia, Franseria malvacea.
Heartleaf Ragweed displays a spreading herbaceous perennial growth habit, reaching up to 2 ft tall with a spread of approximately 3 ft. Heartleaf Ragweed produces small green flowers in inconspicuous clusters.
Leaf size: approximately 4 inches.
How Often Should You Water a Heartleaf Ragweed?
Ambrosia cordifolia requires watering every 3–5 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 3–5 days
Let soil partially dry between waterings
What Light Does the Heartleaf Ragweed Need?
Heartleaf Ragweed thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Heartleaf Ragweed Prefer?
Ambrosia cordifolia grows best at temperatures of 60–80°F. Heartleaf Ragweed prefers humidity levels of 40–60%.
Temperature
60–80°F
Humidity
40–60%
What Soil Mix Works Best for a Heartleaf Ragweed?
Well-draining sandy soil mix with added organic matter. Good drainage is essential for Heartleaf Ragweed to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Heartleaf Ragweed?
Feed Heartleaf Ragweed 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 Heartleaf Ragweed?
Repot every 1-2 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 Heartleaf Ragweed?
Heartleaf Ragweed can be propagated through seeds. Similar propagation techniques also apply to common ragweed plant care, which shares the same genus.
Is the Heartleaf Ragweed Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
Toxic to humans and pets if ingested
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 Heartleaf Ragweed?
Heartleaf Ragweed 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 Heartleaf Ragweed Need?
Heartleaf Ragweed grows outdoors in USDA Zone 9a – 11b. It survives winters down to planting zone 9a. Heartleaf Ragweed is native to northern Mexico and the State of Arizona in the United States. In cooler regions, grow Heartleaf Ragweed as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 9a – 11b
Keep exploring plants
Heartleaf Ragweed 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 Ambrosia genus — compare its care with other Ambrosia species on PlantoScan.
Ambrosia is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Heartleaf Ragweed thrives in bright light and direct sun — see other bright-light plants.
More Ambrosia Species
Other Ambrosia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Ambrosia cordifolia (A.Gray) W.W.Payne, family Asteraceae (first published in J. Arnold Arbor. 45: 421 (1964)) — World Flora Online record, IPNI name record.
- Pet toxicity: Heartleaf Ragweed 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: Fab, Public domain, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 9a – 11b, 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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