vernalize

verb (used with object), ver·nal·ized, ver·nal·iz·ing.

1. to shorten the growth period of (a plant) by chilling or other special treatment of it, its seeds, or its bulbs.

verb

1. to subject ungerminated or germinating seeds to low temperatures, which is essential for many (plants) of temperate environments to ensure germination in some species and flowering in others