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      • Esperanza Hills
      • Hidden Oaks
      • Hsi Lai Monastery Expansion
      • Olinda Landfill Expansion
      • Prado Raceway
    • Sidelined Threats
      • Shell-Aera
      • Tonner Canyon
      • 91 Freeway
      • Pacific Heights
    • Resolved Threats
      • Carbon Creek Restoration
      • Cielo Vista
      • Edison Settlement
      • Edison’s TRTP
      • Madrona
      • National Monument Designation
      • Whittier Oil Drilling
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      • Avifauna (Bird) Studies
      • Corridor Studies
      • Herpetofauna & Amphibian Studies
      • Wildfire Studies
        • Updated Fire Study
        • 2012 Fire Study
      • Other Studies
    • Archived News
    • Email Newsletter Archive
  • Visitor’s Guide
    • Photo Gallery
      • Mammals
      • Birds
      • Reptiles & Amphibians
      • Insects & Spiders
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      • Discovery Center
      • Access
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      • Trail Map (PDF)
    • Puente Hills Preserve
      • Access
      • Recreation
      • Trail Map (PDF)
  • The Corridor
    • FAQs
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      • The Planning Process
      • How to Save Open Space
      • Economic Benefits of Parks
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Non-Native Plants

Castor Bean

Castor Bean

by Melanie Schlotterbeck on March 21, 2020 with No Comments

Castor bean is a non-native plant that grows in disturbed areas and along roadways. Its leaves are easy to identify and its seeds (which are NOT actually beans) are used to make castor oil. Additionally, they contain ricin–a water soluble … Read More

Breaking News Castor Bean, Chino Hills State Park, Non-Native Plants, Puente Hills Preserve
Black Mustard

Black Mustard

by Melanie Schlotterbeck on May 8, 2019 with No Comments

Our friends at Laguna Canyon Foundation had a great article on the infamous “black mustard” (the yellow flower that is all over the hills). It is a nasty invasive non-native plant that prevents our native plants from thriving in their … Read More

Breaking News Black Mustard, Laguna Canyon Foundation, Non-Native Plants

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