Why don't I get flowers on my hydrangea plant

Hydrangeas should be lightly dressed with fast-release fertilizer in March, May, and July. Be sure to spread it around the drip line of the branches and not the base. Water well. If the fertilizer you choose is a slow-release type, remember to lightly cover it with soil to activate the fertilizer

Fertilize monthly during flowering season with 1/2 cup each Epsom salts , aluminum chloride per 2 gallons of water . Creates blue flowers !! Be sure to trim out dead canes once buds start

Are you cutting it back after the growing season? Hydrangea‘s do not bloom on new growth and should not be cut back after the growing season.

https://thistlewoodfarms.com/how-to-make-your-hydrangeas-bloom/

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

https://plantaddicts.com/why-wont-my-hydrangeas-bloom/

http://www.millionplants.com/advice/wont-hydrangea-bloom/