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Here is an article that will help you that outlines all the possible reasons for hydrangea's not blooming. Hopefully you can uncover a reason that resonates with your situation.

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm

You can propagate hydrangeas from cuttings, which is what I think you are referring too.
Here is a link that will explain the process.

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-propagation.htm

This could be a number of things--too little or too much water, over fertilizing, leaf scorch (if planted in too much sun), etc. Typically, in hydrangea, this is caused by a watering issue. Has it recently been planted? If newly planted, there may be gaps in the soil around the root ball that is drying out the roots. I would tamp down the soil around the plant. I would also recommend upping the watering. In addition, it could be suffering from shock. This article will help with that: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

Hydrangeas need to be kept unifromaly moist, but not soggy. It is a good idea to check the soil with your finger and water if it feels dry to the touch about an inch or so. If it's still moist, do not water. You can remove the browning leaves and they should regrow once the plant recovers.

It may be overwatered. Check the soil and make sure that it is damp, but not soaked. Allow it to dry out some between waterings. It should also have good drainage. Root rot also may have set in if it was overwatered in the past. Here is more information on that: https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm

Typically, in hydrangea, this is caused by a watering issue, though it could be a number of other things--over fertilizing, leaf scorch (if planted in too much sun), etc. Has it recently been planted? If newly planted, there may be gaps in the soil around the root ball that is drying out the roots. I would tamp down the soil around the plant. I would also recommend upping the watering. In addition, it could be suffering from shock. This article will help with that: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm