As symbols of eternal life, conifers and evergreens suggest a vigorous, healthy approach to life but they can also express a warning to be cautious and conserve your energy.
Cedar If your dream featured a cedar, could this be a reference to Lebanon (just as a maple might be a reference to Canada)?
Perhaps you associate it with the precious furniture of the Middle East, or is it a reference to the Bible, in which it was often mentioned?
Cypress Common in graveyards, the cypress or false cypress is a symbol of the inevitability of death, but also conjures up the hope of rebirth and new beginnings.
Fir/Spruce Strongly associated with Christmas, the fir or spruce is linked to the birth of Jesus. The image in a dream may express strong positive or negative feelings about family occasions.
Holly Traditionally associated with Christmas, holly is a dream symbol of family festivity and joy, mingled with pain.
Leylandii If you dream of this fast-growing conifer, is someone trying to erect a boundary between you and them in waking life? Or perhaps you are undecided about something and are ’hedging your bets’?
Pine If you dream of pine trees, are you pining for someone or something in waking life? A pine cone, depending on the context of your dream, may also symbolize masculine virility or feminine fecundity.... The Element Encyclopedia
Evergreen trees such as spruce, cedar, and pines signify eternity and immortality. They express everlasting qualities. In your dream, these trees may comment on the longevity of a relationship.... Ariadne's Book of Dream