Pam Peirce has gardened in San Francisco for more than 40 years. She is also the author of Wildly Successful Plants: Northern California. Pam participated in the founding of the San Francisco League of Urban Gardeners (SLUG), an organization that supported both community and home gardeners citywide, serving on its board until 1999. She also taught horticulture at City College of San Francisco for 30 years. Her column runs monthly in the San Francisco Chronicle.