The King’s Mantle, also known as Thunbergia erecta, is a stunning flowering shrub that’s loved for its vibrant trumpet-shaped blooms. The flowers are usually a rich royal blue or purple with a bright yellow center, and in warmer climates, they can appear almost all year long. This fast-growing, low-maintenance plant has small, glossy green leaves and does best in partial sun or light shade with well-draining soil. A little regular pruning helps keep it full and bushy while encouraging even more flowers.