Answer: The most common reason buds fail to open is due to a frost or chill at 'just the wrong time' for that variety. Some years they are wonderful and some years they can 'poop out'. Disappointing, yes, but wait a year. Meanwhile continue to fertilize and water to encourage lots of new growth. If this continues, it may be the plant is planted in a site where it is subject to some other conditions. If it gets prevailing wind (and chill)this could prevent bud development. Or lack of certain nutrients, although this is not likely in most soils. And some cultivars just do not perform well in certain climates. Hope this information is helpful.
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