Buddleja davidii 39purple emperor39 bears extravagant quills of rich purple flowers held above slender grey45green foliage which matures to a creamy yellow hue as autumn begins living up to its name this butterfly bush will attract a mass of pollinating insects to your garden making it an ideal choice for cottage garden borders and wildlife gardens thanks to its compact upright habit buddleja 39purple emperor39 can be placed in borders without overcrowding its neighbours h