Buddleja davidii 39empire blue39 is a sizeable deciduous shrub that bears rich purple blooms upon softly arching stems swathed in slender grey45green leaves with silvery white undersides this butterfly bush was one of the first commercially available blue varieties and despite various new introductions remains ever popular with its upright habit and gorgeous sweet fragrance buddleja 39empire blue39 is the perfect choice for a sunny border height 200cm 40783441 sprea