Vernalization is a process by which flowering of certain plant species is induced or accelerated by exposure to cold temperatures. It prepares plants for flowering by altering the plant's genetic expression. There are two types of strains in cereals - winter strains that require vernalization to flower, and spring strains that do not. Vernalization is reversible through devernalization by exposure to high temperatures. The molecular mechanism involves epigenetic repression of flowering repressor genes like FLC after cold exposure, allowing flowering genes like FT and SOC1 to promote flowering.