Panorama of the San Marcos Foothills Preserve
Plants of the San Marcos Foothills Preserve

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Sonchus asper (Spiny Sowthistle)

Common, non-native annual herb found throughout the Preserve, particularly in disturbed places and along trails. Flowers are yellow. Blooms late winter to spring.

Sonchus asper (Spiny Sowthistle). NON-NATIVE. Pictured in spring.


Sonchus asper (Spiny Sowthistle). NON-NATIVE. Pictured in spring.


Sonchus asper (Spiny Sowthistle). NON-NATIVE. Pictured in spring. This photo shows the rounded lobes on the lower leaves compared to pointed on Sonchus oleraceus.