New rose bush lots oh buds seems happy enough except when buds almost blooming they droop their heads.
They are watered in good sunny spot


Sounds like something may be attacking your rose buds from within, perhaps thrips. Try opening up a bud yourself and checking for something that looks like tiny brown slivers in the bud and top of the stem.  Removing damaged buds and disposing of them in the garbage will help to control them as will spraying with horticultural oil or insecticidal soap as early in the bud stage as possible. For more in-depth information see an article on thrip control on the site of the Marin Rose society at as well as an excellent article on Integrated Pest mamagement from thee University of Davis: