Answer: Based on your description I'm not sure if there is a problem or not; in some cases Japanese beetles will eat into the flowers and cause them to fade more quickly than normal. Otherwise, it may simply be that the weather is taking its toll: as the weeks progress and the season gets warmer (and usually drier) the flowers may simply not last as long. I think too we notice the faded blooms more after the first gorgeous flush of flowers -- there are after all more of the spent blooms on the shrub as time goes on. You might try a deep watering once a week while the plants are in bloom and see if that helps at all. As long as the shrubs seem healthy otherwise I doubt it is anything to worry about.
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