Herbaceous perennials are soft and leafy, not woody or shrubby. They come back year after year to fill your garden with flowers in the warmer months. In subtropical climates they may stick around through winter too, especially if they are evergreen; in cooler regions they'll die back, resting and recuperating, to reappear in spring. And there's the occasional contrarian, that sleeps in the summer heat and blooms in winter chill.
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