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Citrus blooms are the result of a transformation (differentation) of growth buds into flowers. There are several factors that can affect that process. It is often said that "stress" will cause citrus to bloom, cold stress, water stress are considered to be the normal stress that initiates the bloom. In either case, there is a rest period that gives the plant time to convert a growth bud into a flower, so a slow growing plant is more likely to produce fall blooms.