Answer: Based on your description, it is difficult to make a definite diagnosis. In some cases bud blast will occur due to environmental or physical causes such as cold soil, high temperatures during cloudy weather, or due to damage to the roots, or even due to too much shade. However, in a moist season you may also see botrytis, a fungal infection, on the blooms -- poor air circulation, watering in the evenings, and excessive humidity can all contribute to it. To try to prevent reinfection, make sure to deadhead and remove the spent flowers from the garden. With luck it will not reappear next year.
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