Hydrangea no leaves

Question

I have a lot of Hydrangeas in my yard and two of the biggest and oldest ones have no leaves and flowers at the end of the stems. Both of these plants produce flowers on old wood. I didn’t prune them last year. I have fed them and they have Bayer pest control in their roots. This is done twice a year. Last year they were both big beautiful plants. Help!

Answer 1

No leaves on the plant is likely an indication of pests or disease.
Treat with Neem Oil as it works as both an insecticide and fungicide.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm