Ağva Kurfallı Plain St. John's Wort Oil Ağva, one of the most beautiful points where Marmara and Black Sea meet, is famous for its unique nature and rivers. St. John's wort flowers collected from the beautiful, non-agricultural plains of Ağva are also found in the pastures of our bees. Our St. John's wort oil, which we create by soaking it with extra virgin olive oil for a while, is always kept in places away from light.