what are perennial
perennial Related to perennial: perennial ryegrass, Perennial philosophy. (pÉ-rÄnâ²Ä-Él) adj. 1. a. Lasting an indefinitely long time; enduring: an author's perennial popularity among children. b. Appearing again and again or year after year; recurrent: a perennial contender for the championship. See Synonyms at continual.