Black Thistle
Cirsium vulgare
Last reviewed: June 2026
Light
full sun
Water
low
Size
12"–48" H × 12"–24" W
Bloom
Jun, Jul, Aug
Native to
LA
Pollinators
bees, beetles
Browse plants for this ecoregion
Black thistle is a spiny biennial wildflower that produces purple flower heads in summer. This European species has naturalized in disturbed soils and can spread aggressively. It requires minimal water once established and thrives in full sun conditions.
In an HOA neighborhood
Black Thistle takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.
- Sharp spines pose safety hazard to pedestrians
- Aggressive spreader that can quickly dominate area
- Often considered a noxious weed by municipalities
Wildlife value
The purple flowers attract bees and beetles during the summer blooming period. Seeds provide food for goldfinches and other small birds in late summer and fall.
Common questions
- How much sun does Black Thistle need?
- Black Thistle grows best in full sun conditions.
- When does Black Thistle bloom?
- Black Thistle blooms in June, July, and August.
- Where is Black Thistle native?
- Black Thistle (Cirsium vulgare) is native to LA, per the USDA PLANTS Database and regional native plant society lists.
- What pollinators does Black Thistle attract?
- Black Thistle draws bees and beetles.
- Is Black Thistle HOA-friendly?
- Black Thistle takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow Black Thistle? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz