Pruning leaf growth?
We have about 20 Endless Summer hydrangeas near our pool that have had a huge burst of leaf growth in the past 2-3 weeks. The plants have all shot up several long stems with the biggest leaves I have ever seen on them (think 10" dinner plate) that are now 1/3 to 1/2 taller than the rest of the bush (main bushes are about 42"). This new growth is burying the blooms that previously set and flowered so you can barely see them. There is absolutely no sign of flower buds on this new growth, just many more giant leaves. We are not fertilizing them at all, but the weather here has been very warm and sunny for the past month. Can anyone advise whether we can prune off the heights of these new shoots (like 12-15") to keep them from over growing and stop them from smothering the blooms we do have? If we lightly prune this runner growth now, will the plants send out the correct shoots to make fall blossoms? Or by pruning those long runners are we cutting off the second round of blooms that ES hydrangeas give us in September?