Invasive milk thistle in Upper Las Virgenes Canyon Open Space Preserve (Ahmanson Ranch)

alt="Invasive milk thistle (Silybum marianum) in Las Virgenes Canyon. The wetter the Winter, the more milk thistle grows and spreads. March 26, 2024." border="0">

Invasive milk thistle (Silybum marianum) in Las Virgenes Canyon. The wetter the Winter, the more milk thistle grows and spreads. March 26, 2024.

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