Perennial
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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PERENNIAL any plant that under natural conditions lives for several to many growing seasons, as contrasted to an...perennials, may have a rest period of some duration during their life cycle. In the plant different parts rest at different times...and R. E. Lee, Contemporary Perennials (1960); J. U. Crockett, Perennials (1972); A. M. Armitage, Herbaceous Perennial...