Garden Flowers And Garden Ideas : Hydrangea arborescens 'Annabelle' This is a very hardy hydrangea that st… July 7, 2018 0 2887 Flowers And Garden Ideas : Hydrangea arborescens 'Annabelle' This is a very hardy hydrangea that starts out green, turns white and then goes back to green. Cut it back to the ground in late fall for the largest flowers the next year. A keeper!