Plants will often revert to another color/form as recessive genes express themselves. This is very common in seed-grown hybrids. If your plant is self-seeding it is probably doing this.

Linda

Those pink flowers look like periwinkles to me.

naw, daughter, they are dianthus! Look at the leaves.

Thanks for the responses, everyone. It's fun to learn about this stuff. Here's another pic of the flowers close up.

Ah, okay...close up they look NOTHING like periwinkles. :) I have some of those. I love the dianthus because it always comes back and it makes lots of babies.

Dianthus is very hardy! I have some that i planted the summer before last, two "bunches" actually have 2 to 3 different colors of blooms from the same plant. Makes it pretty!

Emma