I'm hoping you will help an inexperienced gardener...

I had quite a few lavendar-pink garden phlox in my border and enjoyed the drifts of color. Three years ago (not realizing the effects of cross-pollination), I made the mistake of planting a white phlox nearby, and the following year had a whole lot more white phlox than pink. When I saw what was happening, I gave away the white phlox I had planted, but this year the remaining plants still have way more white blooms than pink ones. Is there anything I can do to restore the original color? If I have to replant, are there bright pink varieties that are more likely to remain true in color? Thank you for any advice you can give me.

Susie