3 plants are grown in the same environment.Conditions with equal sunlight.Water and space to grow.One plant grew to have a purple flower while the other grew white flowers.What is most likely the conclusion that can be made for the change in flower color

The most likely conclusion is that the difference in flower color is due to genetic variation between the two plants. Different plant varieties can have different genetic traits that result in variations in flower color, even when grown in the same environment.