Salvia Viridis – Marble Arch Blue is an annual belonging to the Lamiaceae family. Interestingly Salvia Viridis – Marble Arch Blue is not grown for its flower but it is the foliage that not only is fragrant but turn to blue during summer. Plant it in the sun in a moist well-drained soil. This plant is also known as Blue-topped Sage or Painted Sage. It can be propagated from seeds planted in early spring.