Rejuvenation pruning Hydrangeas provides a constant cycle of fresh flowering stems. Take approximately 30% of the old stems out each year and you will always have plenty of fresh growth for the following season.
Thank you for mentioning removing the leaves! I've just pruned my first hydrangea and wasn't sure if I should leave them to protect it as it's still a tad cold. If it causes rot, I'll go clear that out tomorrow. Wish mine was as quick as your's haha!
Thanks for the informative video. Is this the type of pruning you would do annually or just when the plant has become overgrown aesthetically? After an aggressive spring grooming like this what will this plant look like at the end of the season?