I have a beautiful citron tree growing in a huge pot in my house. A new tree has begun growing right next to the original one. I would like to separate the new growth and replant it as it may take away nourishment from the full grown one. I can’t seem to get the new one out as the roots are intertwined and attached the the original one and I feel as though I am ripping everything in the pot apart. What is the correct way to get these two apart without killing either one?