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Often spotted in shadier areas and along canyon floors and arroyos, poison oak is common and widespread throughout Griffith Park as both a climbing vine and a short shrub. That old rhyming rule “leaves of three, let it be” stands true here. Every part of this plant—including the leafless branches—contains an oil (urushiol) that can cause itchy rashes on the skin. Symptoms last one to two weeks and can be treated with topical lotions, aloe vera, and antihistamines. Note that the oil can stick around on dogs, horses, or even clothing items, so if you think you came across some on your trip, it’s probably worth giving everything a good, thorough wash.

A bane of hikers everywhere, poison oak (Toxicodendron diversilobum) is present throughout Griffith Park.

When the marine layer sits atop the L.A. basin, expect (and enjoy!) cool, gray mornings.