Where to Plant St. John's Wort
Various species of St. John's wort (Hypericum spp.) grow as evergreen or deciduous shrubs or ground covers in U.S. Department of Agriculture plant hardiness zones 5 though 10, depending on the species. Many produce yellow flowers, dark green foliage and have low-growing, spreading habits. Some species are considered invasive in some areas. Even species that are not classified as invasive can spread aggressively when conditions are right.
Site Preferences and Uses
St. John's worts prefer sites in full sun. Although the plants will easily survive in partial shade, flowering may be reduced. These plants are often planted in groups as a ground cover or as edging. Some of the larger species are suitable for low hedges.
St. John's worts tolerate a broad range of soil types but perform best in well-draining, sandy soils. Some species of St. John's wort can tolerate occasionally wet soils, but they are generally prone to rots caused by excessive moisture around the roots and plant base.
Angela Ryczkowski is a professional writer who has served as a greenhouse manager and certified wildland firefighter. She holds a Bachelor of Arts in urban and regional studies.