More evergreen is a term used to describe plants or trees that retain their green foliage throughout the year. Antonyms for this phrase could include deciduous, bare, or barren. Deciduous plants lose their leaves seasonally, unlike evergreens. Thus, they are not more evergreen. Other antonyms could include withered, wilted, or faded. These words suggest a lack of vitality or life in plants, and are far from describing something more evergreen. It's important to choose the appropriate word to adequately describe the characteristics of plants, especially when discussing gardening or landscaping.