Are you curious about when to prune your big leaf hydrangeas, now that many of your blooms have faded? June and July is the best time to prune your big leaf hydrangeas. On big leaf hydrangeas that are over 5-6 years old, remove approximately ⅓ of the oldest woody stems each year by pruning them to the ground. This will allow your hydrangeas to rejuvenate new growth from the bottom up and you'll have lots of blooms throughout the plant next year. Once you see how many flowers you have next season, you'll have all the neighbors begging to know your secret to creating such full and colorful flowers. Don't forget, big leaf hydrangeas bloom on old wood, so make sure you don't prune them after the month of July or you will be removing next year's flowers. 'Nikko Blue' is one variety of big leaf hydrangea that I like to use on campus and around my home. It grows 4-6 ft. tall with the most reliable rich blue flower heads (in slightly acidic soil); that a Mophead can bloom. Enjoy this great summer bloomer! You are going to like this plant!