St. John’s Wort (H. myrtifolium), which has blue-green foliage and rich yellow ��owers. Hardiness The four St. John’s Wort species covered in this section are suited for zones 8a-10b. Care These hardy perennials are easy to care for once established. A light pruning in winter, if needed, is all established plants require to maintain a desired shape. Give wetland species a drink after a few days without rain. Site conditions St. John’s Wort does best when planted in full sun to part-shade in sandy soils. However, they can adapt to a variety of other soils, including clay and loam, and acidic and lightly alkaline soils. Plants are not salt tolerant and are moderately drought tolerant once established. Keep wetland species moist by adding them to a rain garden or moist site. W14 Photo by Andrea England Fourpetal St. John’s Wort Photo by Peg Urban Atlantic St. John’s Wort makes a delightful mound in the landscape. Photo by Andrea England Woody branches of Atlantic St. John’s Wort Photo by Mary Keim St. Andrew’s Cross seeds Photo by Ron and Diane Bynum St. Andrew’s Cross Note The St. John’s Wort that is promoted as a supplement for use in treating depression is a non-native species. According to Dan Austin in his book, Florida Ethnobotany, using St. John’s Wort can lead to dermatitis or photosensitization due to a hypericin compound found in the plants. Some species may be toxic to livestock.
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