Chilling Requirement

The chilling requirement of a fruit is the minimum period of cold weather after which a fruit-bearing tree will blossom. It is often expressed in chill hours, which can be calculated in different ways, all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures.

Some bulbs have chilling requirements to bloom, and some seeds have chilling requirements to sprout.

Biologically, the chilling requirement is a way of ensuring that vernalization occurs.

Read more about Chilling Requirement:  Chilling Units or Chilling Hours, Chilling Requirements, Models, Stone (prunus) Fruit Tree Selection Guidelines To Match Local Weather Conditions

Famous quotes containing the words chilling and/or requirement:

    I swear to keep the dead upon my mind,/Disdain for all time to be overglad./Among spring flowers, under summer trees./By chilling autumn waters, in the frosts/Of supercilious winter—all my days/I’ll have as mentors those reproving ghosts.
    Gwendolyn Brooks (b. 1917)

    The work of the political activist inevitably involves a certain tension between the requirement that positions be taken on current issues as they arise and the desire that one’s contributions will somehow survive the ravages of time.
    Angela Davis (b. 1944)