Petunia poser

Hi welcome to GoY, not unusual, it just means the plant has got it's wires crossed, and decided to send out the flower of 1 of it's parents, it may revert back again,you never know, Derek.

Agree with Derek, not unusual at all - I have a friend growing these, and she's had all black, half yellow and black, a yellow dot or two and black, all yellow with a few black bits, really quite a large variation. This particular one doesn't seem to hold its colour patterning well.

It's also possible that you could have discovered a new hybrid. You never know, and companies like Thompson & Morgan will pay you handsomely for a new breed. See http://www.thompson-morgan.com/discover-new-plants.

A friend of mine discovered a new flower 10 years ago. He contacted T&M. After 2 years of growing the seeds and doing what they do in the lab, he became richer to the tune of £4,500 just because he had never seen that type of flower before. It's always worth a go.