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.
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.
Does Black Thistle fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.