Eating grapes is supposed to increase the frequency of oracular dreams. Alternatively, according to folklore, eating grapes or raisins aids concentration and conscious alertness. In a dream this may mean improved prophetic abilities or an increased need to focus on studious matters, respectively.
Fertility.
The abundance of grapes on the vine shows that the positive energy put toward your goals will reap rewards.
Fortitude shared with those around you. In a garden, grapes strengthen the hardiness of most nearby plants.
An emblem equated with Bacchus or Dionysus, both of whom had rather roguish natures, being fond of wine, song, and laughter.
For the dreamer, this can reflect more social times or an improved sense of well-being accompanied by playfulness.
If the grapes are tart, this reflects a similarly caustic attitude (e.g., being full of “sour grapes”). [1]
Depth Psychology: The grape is a sexual, erotic symbol.
The urges that drive you are not yet under your control. Grape wine symbolizes the spiritual strength that gives meaning to your life.