So what are biennial plants? The term biennial is in reference to the plant’s longevity. Annual plants live just one growing season, performing their entire life cycle, from seed to flower, in this short period of time. Only the dormant seed is left to cross over into the next growing season.
Perennial plants live three years or more. Usually, the top foliage dies back to the ground each winter and then regrows the successive spring from the existing root system.