With its white bark the birch is read as a fresh start and quiet purity. In northern folk tradition it is the tree of spring, of new beginnings and of protection.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.