This work was conducted to study the effect of two levels (50 and 75%) of pruning on flowering (number of clusters, number of flowers, diameter of flowers, flower-stem length) of three cultivars (Emile Mouillère - Nikko Blue - Pia) of Hydrangea macrophylla. Pruning was done on the shrubs of four years old in addition to a control without pruning. Results indicated that there were differences among cultivars in response to the proportion of pruning. Emile Mouillère, a cultivar with white flowers, the results showed an increase in the proportion of pruning was associated with a reduction the number of fully developed inflorescences per plant compared to control. For Nikko Blue, a cultivar with blue flowers, the results showed that level (75%) was the best in all studied indicators while for Pia, a cultivar with deep pink flowers, the results showed that pruning with 50% level was the best in all productivity indicators.