Why did Hydrangea not flower?
Hydrangea need to be cut back in the fall if you want them to re-bloom the next year. Cut them back to about 6″ and they will regrow in the spring. The ones that bloomed this year might have been new growth. Some people like to leave them up in the winter for winter “interest” but then they perform poorly the next year. Cut them in the spring and its too late. Good Luck!