ev·er·green 
(ĕvər-grēn′)
(ĕvər-grēn′)adj.
1. Having foliage that persists and remains green throughout the year.
2. Perennially fresh or interesting; enduring.
3. Automatically renewed or repeatedly made valid: a contractual evergreen clause.
n.
1. A tree, shrub, or plant having foliage that persists and remains green throughout the year.
2. evergreens Twigs or branches of evergreen plants used as decoration.
3. Something that remains perennially fresh, interesting, or well liked.