Weakleaf Bur Ragweed
Ambrosia confertiflora
- Native to:
- Mexico, Puerto Rico, United States
Richard Spellenberg






Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Asteraceae
- Genus:
- Ambrosia
- Species:
- Ambrosia confertiflora
- USDA Symbol:
- AMCO3
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Forb/herb
- Height:
- 90 cm
- Light Requirements:
- Full Sun
- Drought Tolerance:
- High
- Bloom Months:
- jul,aug,sep,oct
- Bloom Colors:
- green, yellow
Garden & Ecology Notes
- Wildlife Value:
- birds, small mammals
- Fire Ecology:
- Fire adapted — tolerates or benefits from fire
- Fire Notes:
- Resprouts vigorously from root crown after fire. Common in fire-maintained grasslands and benefits from periodic burning.
Soil Requirements
- Soil Type:
- sandy, well-drained, nutrient-poor soil
- pH:
- 6.0 - 8.0 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- native to arid and semi-arid regions
Propagation & Germination
- Stratification:
- None required
- Germination Time:
- 7–21 days
- Notes:
- Seeds germinate readily without pretreatment. Light may enhance germination.
The above propagation data sourced from Claude AI