Feng Dan Bai is the white flower and is used as a graft root so don't know what your pink flower is. You can separate the plants when the upper plant has put on its own roots. Feng Dan Bai will outgrow whatever it is grafted with so it is better to separate or remove it and plant the graft point at least 4 inches deep so as to discourage further sucker growth. Your plant may also just have different color tones.....are the leaves the same shape because Feng has long linear leaves?

One of my trees layered itself. I guess a lower branch was heavy enough to contact soil, by the time I found it, it had put down small roots. I pinned it and layered some dirt and mulch over top. It took well, has been growing for about 18 months. This Spring I will probably remove and re-home it.

That's cool, Jerseygirl322! I can't wait to try that! Make sure you update us on how it does.