Stemless Thistle
Onopordum acaulon
- Native to:
- Algeria, France, Morocco, Spain, Tunisia
Isidre blanc,A. Dobignard,Dinkum,Cavanilles Palop, Antonio José,Leonora (Ellie) Enking,Isidre blanc,Julia Scher,A. Dobignard,Raimuno Calatayud Tormo,Julia Scher,Scher, J. L., D. S. Walters, and A.J. Redford,Scher, J. L., D. S. Walters, and A.J. Redford
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Asteraceae
- Genus:
- Onopordum
- Species:
- Onopordum acaulon
- USDA Symbol:
- ONAC2
Growth Characteristics
- Life Cycle:
- Annual | Biennial
- Growth Habit:
- Forb/herb
- Height:
- 30 cm
- Light Requirements:
- Full Sun
- Drought Tolerance:
- High
- Bloom Months:
- jun,jul,aug
- Bloom Colors:
- purple, pink
Garden & Ecology Notes
- Wildlife Value:
- bees, butterflies
- Deer Resistant:
- Yes
Soil Requirements
- Soil Type:
- dry, sandy, well-drained soil
- pH:
- 6.0 - 8.0 (neutral to slightly alkaline)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- native to Mediterranean regions; prefers open, sunny areas
Propagation & Germination
- Stratification:
- None required
- Germination Time:
- 14–28 days
- Notes:
- Seeds germinate readily in spring without pretreatment. Light may improve germination rates.
The above propagation data sourced from Claude AI
ORGHPS Germination Guide: 15% germination rate; squeeze seeds to determine which are viable