Some cultivars of dahlias (and other common-grown flowers) are not genetically “stable,” meaning the flowers they send up may not always be the same color or shape. Your original purple dahlia was likely a hybrid of several other dahlias, and it just so happens that another color showed up this time.
Some cultivars of dahlias (and other common-grown flowers) are not genetically “stable,” meaning the flowers they send up may not always be the same color or shape. Your original purple dahlia was likely a hybrid of several other dahlias, and it just so happens that another color showed up this time.