Hydrangeas can fail to bloom for many reasons. Not knowing what type of hydrangea it is and it’s cultivar name, consider and research these possibilities: growing in dense shade; applying too much fertilizer; growing out of zone; pruning at the wrong time; winter or frost damage/injury to stems; pests that eat the flower buds; etc.
HYDRANGEAS PLANT CUTTINGS
Cuttings will have no roots to replace lost moisture, so any moisture lost will show as wilting. Covering with something to keep humidity in while still allowing for some airflow can help reduce the number of cuttings lost.
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-propagation.htm
Thank you for partially answering my previous question. I still need to know: Are three+ hours of late afternoon sun harmful to the plant? It gets dappled sun light until 3:00pm. Should I dead-head ALL of the flowers? How soon after dead-heading does the plant form new flowers on new smooth stems? Do they form those smooth stem and 2nd flush of flowers the first year? Do those stems die off? Also what does "remontant" mean? (versus reblooming) Thank you very much, Hannah Nargang
This collection of articles will help you to fill in any gaps.
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea
They are beautiful plants (8) and very healthy. About 4’ tall. What do I do to get blooms? Thank you
It's usually a pruning problem or the "old wood" dying to the ground in winter. Nikko blue is in the macrophylla group and it blooms on last year's buds. Also, they need at least part sun.
This article should help:
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm
They look beautiful and have grown a lot, just no blooms.
Don't prune them again till you see when they bloom. If they bloom in the spring, prune them immediately after blooming. These are typically the big leaf hydrangeas (macrophylla). Endless Summer also blooms in spring then again in late summer. Here is information about when to prune your hydrangeas:
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/common-hydrangea-varieties.htm
https://www.purdue.edu/hla/sites/yardandgarden/hydrangea-popular-but-confusing/
I did not have a single flower just lots of leaves
Hydrangea macrophyllas in your zone 7B can fail to bloom for various reasons: unusually cold winters; some cultivars are more sensitive to winter/frost: florist hydrangeas, variegated cultivars; some of the Teller Hybrids; the plant breaks dormancy and temperatures suddenly crash (common in Atlanta in February or early March; too much nitrogen rich fertilizer; fertilizing too late in the growing season, which keeps the plant in ‘grow mode’ just as early frosts arrive and kill flower buds (your last fertilizer application should occur 3 months before your average date of first frost: the average date falls on weeks 3-4 of October so your last application should occur on weeks 3-4 of July); improper pruning (hydrangeas that bloom on old wood -if they need pruning for some unusual reason- should be pruned soon after the plant stops opening more new blooms in spring. If the hydrangea is a rebloomer, its new spring stems should not be pruned at all. Watch out for pests that nibble on the flower buds (deer, squirrels and bunnies). Very dense shade may reduce blooms. Since flower buds for spring 2023 were created in summer 2022, diseases present in the summer of 2022 or inconsistent watering at that time could have killed spring 2023 flower buds.
How do I improve my hydrangea
Unfortunately, this is a complex issue that depends on quite a few different things. There isn't enough information about the area, conditions around the plant, zone, and other information to give a good answer. I can give you a good starting point, though.
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm