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How does the life cycle of a biennial plant differ from that of an annual?
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Plant
Grandidier's baobas (Adansonia grandidieri) in Madagascar.
The primary difference between the life cycles of annual and biennial plants lies in the duration required to complete their growth, flowering, and reproductive processes.
- Annuals: These plants complete their entire life cycle—from germination and vegetative growth to flowering, seed production, and death—within a single growing season. Once the plant produces seeds, it dies, and the seed is the only part that survives to the next season.12
- Biennials: These plants require two growing seasons to complete their life cycle. During the first season, the plant focuses on vegetative growth, developing roots, stems, and leaves. Often, they overwinter underground, using stored energy to fuel the development of flowers, fruits, and seeds during the second growing season, after which the plant dies.32
While some biennials are harvested after one season for their edible roots (such as carrots), this is a human agricultural practice; if left in the ground, they would naturally proceed to their second-year reproductive phase.31