This bulletin follows the trial of 11 Perovskia at RHS Garden Wisley. The aims of this small trial were to sort out the correct identity of individual cultivars, especially ‘Blue Spire’, highlight Perovskia as a useful late-flowering shrub, assess for the Award of Garden Merit and to make a permanent record through herbarium specimens. There were six entries of 'Blue Spire', four of which were considered to be correct. The Award of Garden Merit (AGM) was re-confirmed for 'Blue Spire'. The bulletin gives details of the trial, including cultivation notes and a cultivar selection guide.