Life … Plants Vascular Plants Dicots Nances, Willows, and Allies St. John's Worts and Allies St. John's-worts Saint John's Worts Olympic St John's-wort species 368 observations Olympic St John's-wort Hypericum olympicum Field notes Key traits Layer Shrubs Light Full sun Moisture Dry Well drained Soil Rocky Sand Loam Clay Soil pH Neutral Habit Cascading Dense Erect Plant type Perennial Shrub From NC State Extension. Close