Because it is an “evergreen”, it has permanent security, i.E. A christian; see “tree”
Cedar In native american lore, a wood burned to ward off bad dreams.
Cedar Tree A strong, flourishing person, Ps. 92:12
Cedar To dream of cedar denotes happiness, joy and peace (Artemidorus) ; a symbol of incorruptibility (Bayley) ; the cedar of Lebanon, by its height, perfume and healing qualities was a symbol of goodness and of the Virgin (Clement).