- May 11: California Ethnobotany for Learners of All Ages – talk by Jane Rieder (Virtual) – SCV Chapter
- May 14: China Creek Work Party – Sequoia Chapter
- May 14: Native and Drought-Tolerant Plant Sale – Woodside-Atherton Garden Club
- May 15: Exploring Coastal Habitats at Save the Redwoods League, Lost Coast Redwoodst – DKY Chapter
- May 15: Braiding Sweetgass – An Evening with Dr. Robin Wall Kimmerer (Virtual) – Peninsula Open Space
- May 15: Botany Roadtrip with Matt Berger (Virtual) – Backcountry Press
- May 16: Porterfield Creek Open Space Preserve, Cloverdale – Milo Baker Chapter
- May 21: Napa Valley Spring Plant Sale – Napa Valley Chapter
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