The elder was believed to house a protective spirit, and its creamy flowers are gathered in early summer. Elderflower is read as protection, healing in the symbolic sense and the threshold between seasons.
Has this come up in your dreams before? What was going on in your life then?
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.