I don't think that's a good idea. Cutting all of the blooms off may inhibit blooming next year. I have gorgeous hydrangeas. I don't touch them at all until March (I live in the Northeast) or early April. Then I hand prune the tops of the stems that bloomed last year, and cut off any dead canes. I then add Epsom Salts in a ring around the plant and water it in lightly. Come late spring, early summer, they are profuse with blooms. I hope this helps.