Also known as Argentina Cocklebur · Argentine Cocklebur · Bathurst Burr
Safety note: This plant may be toxic to humans and pets. See toxicity details.
Cocklebur (Xanthium ambrosioides) is a coarse, erect annual weed with burs that readily attach to fur and clothing, posing a nuisance in disturbed areas.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Thrives in direct sunlight for at least 6-8 hours per day.
Moderate to High
60% intensity
Prefers consistently moist soil, but avoid waterlogging.
Adaptable, prefers moist, well-drained soil
50% intensity
Warm
75% intensity
Prefers warm temperatures and is sensitive to frost.
Low
25% intensity
Requires minimal fertilization; a light balanced feed in spring is adequate.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | Yes 5/5 intensity |
| Toxic for pets | Yes 5/5 intensity |
| Edible | No |
All parts of the plant, especially seeds and seedlings, are toxic.
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Cocklebur prefers consistently moist soil, especially during its active growth phase. Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogged conditions, which can lead to root rot.
Reduce watering during dormancy in cooler months.
Pruning is typically not necessary for Xanthium ambrosioides unless it is being managed for a specific purpose, such as preventing seed dispersal or controlling its size.
If pruning is required, do so after flowering and seed set to avoid spreading seeds. Remove any dead or damaged stems as needed.
Xanthium ambrosioides is primarily propagated by seed. Seeds can be sown directly outdoors in the spring after the last frost, or started indoors a few weeks prior. Germination is usually straightforward.
The plant also readily self-seeds.
Repotting is rarely applicable as Xanthium ambrosioides is typically grown as an annual or a biennial in its natural habitat and is often considered a weed. If container-grown, it may need repotting if root-bound, but it generally thrives in situ with minimal disturbance.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Cocklebur (Xanthium ambrosioides)
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Xanthium |
| Species | Xanthium ambrosioides |
Similar in genus Xanthium
Answers based on plant encyclopedia data
