Biennial Daisies are flowering daisies that take two years to complete their life cycle. In the first season the plant grows leaves, stems, and roots. Usually the stem remains very short and the leaves are low to the ground, forming a rosette. The biennial daisy remains dormant over the colder months. Many biennials require a cold treatment, or vernalization, before they will flower. During the next spring or summer, the stem of the biennial daisy starts to grow taller. The plant then flowers, producing seeds before it finally dies.
Sometimes when a biennial has been exposed to extreme cold temperatures it might speed up its life cycle. After this vernalization period the plants will flower and set seeds within a few months instead of a couple of years. This way they can be grown as annuals. This is often done to biennials that are grown for consumption in cases where the roots or leaves are edible.