If Annabelle is blooming and the others are not, that tells me that there may weather related events that are killing the flower buds.

Paris develops invisible flower buds in July-August (August-ish in northern states) so one has to take care that they do not get killed by cold, lack of water or deer.

If the weather gets too cold in winter and the stems die off, all Spring growth will originate from the base but those brand new stems will not have flower buds until they normally develop them again in the next July-August period. Mopheads and lacecaps like Paris only bloom on old wood so they tend to have blooming reliability issues in Spring in cold zones so, some people either get rebloomer mopheads that produce bloom from old wood and new wood or they get new wood blooming hydrangeas like Annabelle and paniculatas.

To improve the odds of bloomage in your favor, I would suggest making sure you mulch well and that you also winter protect the shrub when they go dormant in the Fall. Then a couple weeks after your average date lf last frost, remove the winter protection.

If you apply enough winter protection, the stems and the flower buds should survive and leaf out in Spring. Do a search in the forum for 'winter protection' to see what people do. Usually, one puts chicken wire around the plant, pile mulch or dried out leaves in the Fall and top with cardboard and a few rocks. The chicken wire should be taller than the plant is supposed to get and wider. If your garden does not produce enough leaves to pack a whooooooole bunch inside the chicken wire then try using mulch. Get chicken wire with small holes if using mulch so the mulch will not get out thru the holes.

Yes, all Citylines series bloom mostly on old wood. If you want better success, try finding a variety (such as the Let's Dance series) that can bloom on new wood. And we're talking hydrangea macrophylla here. Annabelle are hydrangea arborescens which bloom strictly on new wood.

Luis_pr & springwood_gardens, that is some great insight! Thank you!

I assume that the issue would be the cold (I am in zone 5a). The raised beds are all on an irrigation system so lack of water is definitely not the culprit - they are well mulched but not winter protected, and deer are also out of the equation. I will have to try and figure something out for protection over this winter to see if I can get them to bloom next year. I love the glossy foliage on these plants so I am not quite ready to give up on them just yet

If you have storage space in the garage or shed, you could grow it in a container instead and store it in the garage when it goes dormant.

That could also be doable, I'll give it a go this year with good protection over the winter. I was able to find some interesting ideas/methods now that I know what I am looking for (thanks again for the suggestions)

If that doesn't seem to do it I may have to go with the pots if I cant get these gals to bloom by next year