Biennial, any plant that normally requires two years for its life cycle. Biennials store food in the first season of their growth, flower and bear fruit in the second season, and then die. Familiar examples are foxglove, hollyhock, and pansy. Many cultivated vegetables are biennials, for example, carrots, turnips, parsnips, parsley, and celery. Biennials often become annuals when early sowing or warm weather causes the earlier development of a flowering stem. Less hardy varieties are often routinely treated as annuals.
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