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Many over-wintering plants,through valization,overcome a block to flowering and thus acquire competence to flower in the following spring after experiencing prolonged cold exposure or winter cold.The valization pathways in different angiosperm lineages appear to have convergently evolved to adapt to temperate climates.Molecular and epigenetic mechanisms for valization regulation have been well studied in the crucifer model plant Arabidopsis thaliana.Here,we review recent progresses on the valization pathway in Arabidopsis.In addition,we summarize current molecular and genetic understandings of valization regulation in temperate grasses including wheat and Brachypodium,two monocots from Pooideae,followed by a brief discussion on divergence of the valization pathways between Brassicaceae and Pooideae.