Amy Stewart will discuss "Wicked Plants: The Weed That Killed Lincoln's Mother & Other Botanical Atrocities" at 7 p.m. April 29 at Vroman's Bookstore, 695 E. Colorado Blvd., Pasadena; (626) 449-5320; vromansbookstore.com. At 7 p.m. April 28, she will speak on her 2007 book, "Flower Confidential," about the cut-flower business. That talk is at Crowell Public Library, 890 Huntington Drive, San Marino; sanmarinopl.org. Stewart's site: www.amystewart.com.
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