Answer: There are only two possibilities: they are not the original bulbs (which must have died out) but their offspring, which have reverted. Or, some bulb experts insist that flowers tend to turn yellow or white as the bulbs get older. Bulb growers confirm this occurrence, but don?t have a good explanation for why. This color-change phenomenon is one of the reasons older bulbs are discarded and younger ones replanted when bulbs are dug and divided.
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