The adjective evergreen (the Latin term sempervirens is also used) describes plants or plant formations of which the foliage remains present and green throughout the year.
Characteristics of evergreen organisms
Evergreen organisms, contrary to deciduous organisms, do not lose their leaves or needles in large quantities during a specific season, but gradually throughout the year. Therefore, they do not appear to be lacking in foliage at any one point in time.
Holly (Ilex aquifolium) is an evergreen shrub. © Semnoz, Wikimedia CC by-sa 3.0