For more Oregon reading , check out: 1  These Are The 10 Best Places To Retire In Oregon. 2  These Are The 10 Most Miserable Cities In Oregon. 3  These Are The 10 Drunkest Cities In Oregon.
A perennial plant or simply perennial is a plant that lives for more than two years. The term is often used to differentiate a plant from shorter-lived annuals and biennials.
Perennials are classified in various ways: 1  Herbaceous. Plants that die back to the ground each winter and have new stems that grow from the roots each spring. 2  Woody. Plants where the top persists, such as shrubs or trees. 3  Deciduous. Plants that shed their leaves and are leafless during a portion of the year.  Evergreen.