During a garden photography course I taught in the summer of 2013 an experience photographer replete with all of the equipment would would ask for asked me what the secrets were for getting a shot with all of the flowers at their peak. It was evident from the flowers in question that it was unlikely that all the blossoms in the shot would bloom at the same time or have life cycles long enough to maintain their unblemished petals long enough for the other buds to open. The options would have been to wait or keep shooting but it may have been his preference that I suggest photoshopping the images or coming up with some concoction that could be fed to the plants to synchronize their life cycle in some way.
The desire to have a garden show its best face or bring some perfection to our eyes to please an audience whether is a narrow vision and there likely isn't an appropriate feature on a Swiss Army Knife to achieve that goal. There are gardeners who likely obsess over the details and their definition of "cleanliness" in the garden that drives them to pick, root and deadhead through their gardens constantly. Such an attention to detail may engender a profound familiarity with the garden but it does so at the expense of taking the gardener out of the moment.
The obsession with controlling the garden and ensuring that it is in some ideal state actually takes the gardener out of the moment. The requirement that the garden be in some state of order arbitrarily defined and chosen by the gardener is an attempt to impose some form of uniformity in the garden that disables the gardener's vision or acceptance of the patterns and cycles that are occurring in that defined space. This impulse to control should not flourish is gardens. It is bad enough that it happens on mono-crop industrial farms. In the garden, the plants, gardener and whoever happens upon it ought to have the opportunity to find new microcosms with each visit and turn of the head and never trouble their minds or backs with the matter of disposing of fallen petals.