I heard on TV, last Fall, you should cut back your Hydrangeas either in the Spring or Fall. When I looked up the information on the internet, I got confused. It evidently depends what kind of Hydrangea you have. Can I prune my Hydrangea now? From pictures that I saw on the internet, I believe it's a Annabelle Shrub.
Washington County Minnesota
Hydrangeas that bloom on new wood, like Annabelles, can be pruned now. Ones that bloom on old wood (bigleaf hydrangeas, which are not as common for us as they are not as hardy) should be pruned right after the blooms fade as they start forming new buds soon after.