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Any plant that completes its life cycle in two growing seasons. During the first growing season biennials produce roots, stems, and leaves; during the second they produce flowers, fruits, and seeds, and then die. Sugar beets and carrots are examples of biennials. See alsoannual, perennial.
This entry comes from Encyclopædia Britannica Concise. For the full entry on biennial, visit Britannica.com.