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Plants that take two growing seasons to complete their lifecycle.

In the first growing season, the biennial plant will set roots and grow leaves. Typically, the plant will grow in a rosette form (a circular arrangement of leaves that are usually near the soil), remaining short and having smaller leaves than those that will appear in the second season. The plant will go through a dormant period triggered by colder temperatures (not necessarily a defined length of time), and then, in the second year, or warm season, will send up stems and leaves, flower, become pollinated, go to seed and then die. Examples of biennials are parsley, foxglove, hollyhock, and sweet William.