Lanceleaf ragweed (Ambrosia bidentata)

Lanceleaf ragweed

Ambrosia bidentata is an annual herb up to 1 m tall. Leaves have only a few lobes compared to the complexly divided leaves of some related species, sometimes no lobes at all. Flower heads are small and inconspicuous, as the plant is wind-pollinated. The heads develop into spiny burs as the seeds ripen.

Scientific classification

Species

Lanceleaf ragweed (Ambrosia bidentata)

Asters bellflowers fanflowers and allies

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Herb

Plant Type

Summer, Fall

Bloom Time

Deciduous

Leaf type

Images of Lanceleaf ragweed

Distribution of Lanceleaf ragweed

Distribution Map

Lanceleaf ragweed's native range encompasses the temperate and subtropical regions of North America. It has been introduced and can be found in similar climates on other continents including parts of Europe, where it has established a presence. The plant is typically found in disturbed areas within its introduced regions.

Native

Cultivated

Invasive

Introduced

No species reported

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Care Guide for Lanceleaf ragweed

Every week

Water

Full sun

Sunlight

Water: Lanceleaf ragweed thrives in conditions with periodic hydration and drying phases. Drought-tolerant, it prefers thorough watering with soil allowed to dry out weekly. Adequate moisture during the growing season is essential for optimal growth and environmental resilience.

Fertilize: For lanceleaf ragweed, apply balanced or high-nitrogen fertilizers starting in early spring, increasing every 4-6 weeks. During peak growth, use a moderate dose monthly. Reduce feeding in late summer to maintain form, and always adhere to product instructions to avoid over-fertilization.

Pruning: Lanceleaf ragweed features lance-shaped leaves and benefits from early to late spring pruning. Trim dead stems to encourage growth and manage spread, while avoiding heavy pruning outside recommended seasons. Use clean, sharp tools for optimal results, as pruning promotes denser foliage and reduces allergenic pollen production.

Propagation: Native to North America, lanceleaf ragweed belongs to the Asteraceae family and thrives in diverse conditions. Effective propagation requires surface sowing seeds for light exposure. Well-draining soil enhances growth, and in situ transplantation minimizes root disturbance. Careful management is essential due to lanceleaf ragweed's potential for aggressive spreading.

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