<P> 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 . </P> <P> Some bulbs have chilling requirements to bloom, and some seeds have chilling requirements to sprout . </P>

What does chill hours mean for fruit trees
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