When and How to Prune Hydrangea ‘Annabelle’ I’ve pruned my Annabelle hydrangeas in late winter before, but now I prefer to prune them in early spring. You can prune Annabelle hydrangeas either in late winter or very early spring. Personally, I prune mine down to about 15 cm (6 inches) from the ground to encourage large blooms. However, these bigger flowers often require staking for support. If you’re concerned about pruning too severely, you can prune to about 30 cm (12 inches) from the ground i

How to Prune Hydrangeas