Answer: The damage is obiviously already done and you won't have the lovely flower display that you anticipated. You're right, hydrangeas should be pruned after they've finished flowering, not before. However, an established hydrangea will overcome the shock of poor pruning and yours will probably rebound later this summer. I'd wait until this winter to do any additional pruning. You may want to even things up and it's easier when all you see is bare wood as opposed to branches in full foliage. In my garden, I prune my hydrangeas back to knee-high during the winter months. In the spring the bare stems produce lots of new flowering stems. I also completely remove any obviously dead stems growing from the center of the plant. This keeps the shrubs in constant renewal and I always have lots of flowers. Maybe this is the type of pruning you can try this winter. There will be less debris to have to cart off, and you'll be able to see what you're cutting. Best wishes with your hydrangeas!
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