Different Flower On Plant.

Question

I’ve planted a Calibrachoa and a Felicia in the same pot and the Calibrachoa has developed a Felicia flower among it’s normal flowers. How has this happened?

• 

Answer 1

Sometimes plants like this can drop seed, or drop pieces of itself to root elsewhere. Likely, this has happened, here, and the plant has flowered among your others.

https://www.gardeningknowhow.com/ornamental/flowers/felicia-daisy/growing-felicia-daisy-plants.htm

https://www.gardeningknowhow.com/ornamental/flowers/million-bells/calibrachoa-million-bells.htm

Answer 2

The different flower was actually part of the Calibrachoa it wasn't among the normal flowers.
The Felicia type flower was growing on a stem of the Calibrachoa.