Grapes, representing the food of the Gods, can symbolize Spiritual wisdom and the search for immortality.
Psychological / Emotional Perspective:
Grapes appearing in a dream can represent sacrifice, in the sense of making something sacred. We need to give something up in order to achieve what we are really looking for. Wine is often taken to represent such sacrifice because it has a close religious affiliation with blood and, because of its colour, with blood sacrifice.
Everyday Material Aspects:
To see grapes in a dream generally indicates that there is a need for celebration. The grape is the fruit most closely associated with the Roman god Bacchus or, in his Greek form, Dionysus who was the god of conviviality. To dream of grapes indicates we are searching for fun, laughter and creativity in our lives.
You might also like to consult the entries for Fruit and Wine.