Perovskia atriplicifolia 'Kuperba' (BLUE ARROW) is steeply upright growing and vigorous. This new variety is a marked improvement on 'Blue Spire', which is rather disparate. The flowers of BLUE ARROW are lilac blue, the leaves and branches are gray-green and strongly fragrant. Perovskia is called Russian sage. The plant was bred by H.J.M. Kuijf from Boskoop, who also markets the plant and has submitted it for inspection. Plant breeder's protection has been applied for.