Where are you located? In colder areas (as in, colder than zone 7) the bigleaf hydrangeas simply won't bloom reliably without winter protection. Even in zone 7, late frosts can kill the year's flower display. And I've never seen the rebloom be remotely impressive where I am - 1 or 2 blooms if I'm lucky.

Sounds like you have a mophead (ES), a paniculata and 3 undetermined ones. Please post pictures of the 3 unknowns. A pic of each shrub, any blooms and some pic of leaves.

Please elaborate on the care that the shrubs get. Fertilizer? Sunlight? Water? Pruning, if any? Do you have deer, squirrels or rabbits?

Like illsstep suggested, let us know where are you, your USDA Zone and how has your weather been lately.

The pink ones could be one of the pink forms of Hydrangea arborescens, smooth hydrangea, like Annabelle but pink.

Where are you? Do you fertilize intentionally at all? If so, with what and how often? Or might they be getting some lawn fertilizer due to runoff or over cast? Do they get any sun and is the shade they get only from he house or also from overhanging trees? Or put another way, how deep is the shade they are in? What is your soil like? (clay, loam, sand?). Did you dig around in the bed before planting And if so was there buried construction debris or lots of rock or anything else that might interfere? Do the plants show any distress such as yellow or limp leaves? Do you do any pruning, and if so, when?

Too much fertilizer, especially nitrogen, can encourage a plant to grow leaves at the expense of flowers. In all honesty, my plants get mulch or compost but not fertilizer.

Too little sun can reduce flowering. In my central NH garden, my smooth hydrangeas get morning sun until 1 or 2 pm and my panicled hydrangeas get all day sun, or at least 10 am until sunset. I have given up on big leafed hydrangeas Like ES. They do best in coastal zones which tend to avoid sudden drops in temperature and extremes of temperature.

Pruning at the wrong time can reduce flowering.

if you can add some photos in a comment that might help. Include plant photos as well as further back photos of their site.

I live on the border of 5b 6a. I don’t fertilize often. I’ll try to find pictures in the morning, so please stay tuned!

Can you add generally where as well as zone? Gardening in Midwest clay is quite different than in rocky, acid, New England soils though zones tend to be similar.

is not often once a year or less often for fertilizing?

Good morning, everyone! I am posting a couple of pictures and will try to answer everyone's questions as best I can. And thanks in advance for your help.

• Location. We live in rural, northeast Kansas, bordering zones 5b and 6a. We have hot summers, cold winters, and lots of wind. This year we had one of the wettest springs on record. Last year we had serious drought. The poor blooming thing has been going on for several years in a range of conditions.
• Sun. Besides the shade of the house, the Pee Gee and 3 unknowns get shade from a pin oak tree (the attached photo might help). They do get some direct sun late afternoon/evening when the sun is low (and still hot!) and shines below the lowest limbs.. The Endless Summer (and the other 3) get more afternoon sun.
• Fertilizer. This is a weak spot for me. I try to fertilize once a year in the spring. I know I did last year, I know I didn't this year. There would be no runoff of lawn fertilizer..
• Water. They're all on sprinkler hoses under the mulch, so I water when needed. I leave it on for a while (an hour or two), but I've never known how long to leave them on to equal an inch of rainfall.
• Pruning. I don't prune other than cutting off last year's stems well into the new season after I'm sure they're not going to green up. Here I'm referring to the 3 unknowns. I don't prune the ES at all. The only pruning I do with the Pee Gee is trim around the base of the trunk to help the tree form, although I'm really not very picky about the form. It's probably more broad at the base than it should be to be recognized as a true tree form.
• Critters. No, we don't have trouble with deer on our property. There are squirrels and rabbits (occasionally) around, but not a lot and have never noticed them interested in our shrubs.
• Soil. I've had the soil tested by the local extension office (who sends it to K-State). It's good. And yes, it was tilled and prepped pretty well before planting.
• The unknowns. The largest is about 3'x3'. The smallest about 18"x18".

About the photos. The one is a close up the largest unknown and the single bloom that is well past its prime. The photo of the north side of the house (the land slopes away from the house, btw): The 3 unknowns are on the left side of the photo which is the east end of the north side of the house. The Pee Gee is in the middle in front of the bay window. Those all get shade from the oak tree in the foreground. The ES is next to it. The Fire & Ice and Fire Light are on the far right, which is the west end of the north side of our house.

I think I've covered everything. Thanks, again, for your help.

Thanks so much, NHBabs. Yesterday I called a greenhouse in Topeka (@ 45 mi. away), and they said almost the exact same thing on the bigleaf, so I'd been thinking I should maybe replace them. When I looked yesterday, I did see some buds on the PeeGee, so it's just really late, I guess. The guy I spoke to also said that whereas panicles and oak leafs bloom white, then turn pink in some climates, they don't turn pink here because that requires cooler nights, which we don't get. White is okay, but I've got an awful lot of white already and against a white house, I'd prefer a little more color.

Do you have any favorite shrubs for shade? I have a LOT of shad, which is good in most respects. It just limits the flowering options. Thanks!