Salvia can be annuals, biennials, herbaceous or evergreen perennials, or shrubs. They have paired, simple or pinnately lobed, often aromatic leaves and 2-lipped flowers in whorls, forming simple or branched spikes or racemes
'Cambridge Blue' is a tuberous-rooted herbaceous perennial to 75cm in height, with large, oval, pale green leaves and slender spikes of light blue, two-lipped flowers 2.5cm across