Vernalization promotes flowering by

Vernalization is a process where prolonged exposure of plants to cold temperature ($5-10^0$ C) results in a flowering stimulus. This help plants to flower in spring instead of fall. This sensitivity or recognition of cold temperature is localized in different sites in different plants such as germinating seed, embryo, shoot apex or leaves. As the stimulus is received, Mechler suggested that plants release a compound that makes the plant perceptive of the temperature stimulus and further aids in flowering.