Hydrangea paniculatas normally require full sun to perform at their best so examine how much direct sun it actually receives. In shady-er spots, if the shrub gets unequal direct sunlight or if interior sections of the shrub are shaded, the stems may then stretch, become thin and weak, and lack the energy to initiate flower buds, resulting in blind shoots or stems with no blooms. Consider using annual pruning in late winter or early spring to remove thin/twiggy growth so the plant allocates the energy into strongest stems instead. Also, ensure you do not over-apply fertilizer or use a fertilizer with too much nitrogen.

Thanks luis!

There has to be 8+ hours of direct sun, but my trees are casting more shade each year, so I'll keep an eye on that.

I've noticed this from day one.

Removing the twiggy growth was what I wondered about and will do that.

I haven't fertilized at all yet but considering my soil type and nutrient levels, I'll do a little next spring.

Thanks again! ;-)

I did get a few really large panicles this season (right side of picture), but I'll have to read up on proper pruning these.

One of the strong shoots came from the ground near the trunk, another came from half way up an existing branch that also contained a couple of really whimpy limbs. I'll figure it out. ;-)

Best one for this year. Hope to have the whole bush look like this next year. ☺️

I guess the flowers did get darker towards the end. Limelight in the background.