Sipacupa Blue Vervain Tea Bags 24. Blue Vervain (Stachytarpheta Jamaicensis) is a perennial plant with tiny purple-blue flowers. It grows across Jamaica and in the Caribbean and Central America. The aerial parts of the plant are used to make tea. We recommend that you consult with your health provider and continue to research the attributes of this versatile product. We hope this product will contribute positively to your health and wellness.