Salvia guaranitica (Argentine Skies)
From a large area in South America, this pale blue cultivar of S. guaranitica was introduced in 1990. It will grow to 4-5ft tall and is of upright growth. Reliably hardy, it should be cut down when frosted, and it will resprout in May. It is in flower from mid-summer onwards, and seems happy in either full sun or partial shade. It spreads by underground tubers, which incidentally can find their way very deep into the soil, making it a difficult Salvia to remove, should you want to.