A plant kept indoors depends entirely on the care it is given, so dream books read it as something in your life that grows only as far as your attention lets it — a project, a bond or your own wellbeing.
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.