It is a symbol of a strong, healthy nature, that everyone dreams about.
see: it promises good health
a green oak: someone will make a mess in your life
see the splendid oak: a long life and prosperity
see an oak without leaves: troubles
see withered tree: a separation from relatives, friends, or their death
large and densely leaved: happiness and longevity
sit under an oak tree during a hot day: a devoted friend will protect you from evil
stand under an oak tree in the storm: the announcement of danger, from which you get out alive