The only explanation I can give is that Dahlias are notoriously unpredictable from seed due to a high occurrence of genetic mutation. If you want reliable flower colors grow them from tubers or cuttings.

My feeling is unless the company's seed catalog or web site states that there's a high probability of plain/non-variegated flowers, you have a right to contact them to voice your disappointment(pleasantly, though) in their stock and your results. Usually you see mentioned that there's a 10% or other chance you'll obtain solid colors from such packets; your results are out the realm of acceptance. I would think that the 'Fireworks' growers would have weeded out plain-colored offspring to better guarantee one's success. Let the company know about your outcome, and they may send you a replacment packet free to test this coming year. Good luck.

I did contact the company; they said the seed they bought from the supplier must not have been mixed very well. They gave me a refund. I was very pleased with their response. Thanks to both of you for you opinions and advice. Maxcy