Given that they were both experienced reference librarians, Deatra Cohen and Adam Siegel began to explore their Ashkenazi roots and the folklore surrounding medicinal healing using plants. Twenty-six herbs were indexed in the Materia Medica. In their book “Ashkenazi Herbalism: Rediscovering the Herbal Traditions of Eastern European Jews,” the couple researched the accounts of community healing and native plants — including St. John’s wort, comfrey, and nettles — used as remedies to treat a range of ailments.