Flooding is a perennial problem for people living by the river.
The problem … is inherent and perennial in any democracy, but it has been more severe in ours during the past quarter-century because of the near universal denigration of government, politics and politicians. —Michael Kinsley, Time, 29 Oct. 2001
… scientists are warning that a perennial viral threat, the upcoming flu season, could be far more dangerous than usual—more evidence that these tiny foes are responsible for a large share of human suffering. —Claudia Wallis, Time, 3 Nov. 1986
The issue between science and art is of perennial interest to me, since I started off in science in college, in medicine, was headed for psychiatry, and ended up writing novels … —Walker Percy, “The State Of The Novel,” 1977, in Signposts in a Strange Land, 1991
: present at all seasons of the year <perennial rhinitis>
Any plant that persists for several years, usually with new herbaceous growth from a part that survives from season to season. Trees and shrubs are perennial, as are some herbaceous flowers and vegetative ground covers. Perennials have only a limited flowering period, but, with maintenance throughout the growing season, they provide a leafy presence and shape to the garden landscape. Popular flowering perennials include bellflowers, chrysanthemums, columbines, larkspurs, hollyhocks, phlox, pinks, poppies, and primroses. See alsoannual, biennial.