To dream of a single bush may represent feelings about some area of your life doesn't do anything at all except be noticed.
Negatively, dreaming of a bush may represent feelings about something in your life that's presence bothers when you feel it doesn't need to be present. A boring or annoyingly useless obstacle. A person or situation that bothers you that it doesn't do anything at all.
Example: A woman dreamed of seeing bushes on the side of a road. In waking life she was beginning to suffer from hallucinations that doctors couldn't figure out. The bushes may have reflected her feelings about the hallucinations being present in her life while having no meaningful purpose.
*Please See Hedges