POTRERO HILL: If we might take only the briefest break from steel and lumber— the Friends of the SF Public Library are putting on a tour of the neighborhood's "hidden gems." That is to say, other people's gardens. "Learn secrets of gardening on the Hill, purchase interesting plants, ask questions of master gardeners," but best of all for you plant voyeurs, "see your neighbors' yards." $25 a ticket, $40 a pair, 10 a.m. to 3 p.m. Sept. 13. [Curbed Inbox]
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