Within the Perovskia atriplicifolia article...


'Blue Spire'

A particularly fine variant of P. atriplicifolia, with distinct foliage. The uppermost leaves are narrowly elliptic-oblong and pinnately lobulate, the lower ones up to 2 in. long, cut more than half-way to the midrib into lobes which are themselves lobulate. It is of upright habit, to about 3 ft high, and bears its flowers in large panicles. It has been suggested that ‘Blue Spire’ is a hybrid between P. atriplicifolia and P. abrotanoides. But in the Kew Herbarium there are specimens from Kashmir and Lahul (where P. abrotanoides does not occur) which, though they lack the lower leaves, seem to agree quite well with ‘Blue Spire’. It was distributed under its present name by Messrs. Notcutt and received an Award of Merit when exhibited by them on August 28, 1963. It came originally from Germany as P. atriplicifolia erecta.