Everlasting Amethyst Hydrangea
Zone  5 - 9
Definitely a WOW! plant.  Large ball-shaped flowers change from solid green to fuschia or violet-blue depending on soil acidity. Everlasting blooms from May to September on old wood.  Excellent compact shrub with very sturdy stalks bearing the large blooms well above the foliage.  A fabulous cut flower.  Easily grown in part-shade and moist, well-drained soil. Do not prune.  Blooms on old wood.  Remove dead or damaged wood in the spring. HEIGHT:  80-100 cm   SPREAD:  80-100 cm
All hydrangea flowers do undergo some colour changes as they age.  Also soil pH can change the flower colour of some cultivars.
3 gallon container size  
Image courtesy of Plants Nouveau