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A biennial plant lives for between twelve and twenty four months. A typical biennial will grow leaves and stems during the first summer, go into dormancy over winter, and then flower and seed during the second summer.

Examples of biennials are parsley and chervil. Some biennials, such as leeks, which are harvested for their stems or roots, are harvested within their first year.

Because of their short lifespans biennials are not suitable for propagating by cuttings. Propagation with seeds tends to be more succesful than with annuals however.