ver·nal·i·za·tion 
(vûr′nə-lĭ-zāshən)
(vûr′nə-lĭ-zāshən)n.
1. The induction of flowering by prolonged exposure to low temperatures, as during the winter in a temperate climate.
2. The exposure of seeds or plants to low temperatures in order to induce or hasten flowering.
vernal·ize′ v.