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
'Blue Enigma' is a tall perennial with ovate leaves and terminal and axillary spikes of deep blue, two-lipped flowers 5cm in length, in late summer and autumn