vernalisation

/V ER1 N AH0 L IH0 Z EY1 SH AH0 N/
noun
  1. 1

    (agrobiology) The treatment of seeds or bulbs by exposure to low temperatures so as to decrease the vegetative period or to cause the plant to flower or bear fruit more quickly.

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Source: https://en.wiktionary.org/wiki/vernalisation, https://en.wiktionary.org/wiki/vernalization