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CHILL FACTOR

Fruit and nut trees have what is called a chilling requirement. This requirement varies between varieties within a kind of fruit. The chilling requirement for a variety is defined as the accumulation of hours below 7C. Satisfying the chilling requirement will result in normal growth and bloom following a dormant or winter period. During extremely mild winters the chilling requirement may not be met and will result in uneven bloom. The tree will remain dormant until early summer when a small shoot or several fruit will form on the end of a long naked branch. Varieties that have a chilling requirement of 600 hours or below are termed "low chill" varieties. In general, the higher the chilling requirement of a variety, the later bloom will occur in the spring.

Table. General Chilling Requirements of Various Fruits and Nuts Fruit or Nut Chilling Requirement (hours)

Almond 400 - 700
 
Apple 300 - 1200
Avocado NONE
Apricot 300 - 1000
Citrus NONE
Chestnut 400 - 750
Grapes 100 - 500
Fig 100 - 500
Olive 400 - 700
Kiwi 400 - 800
Pear 150 - 1500
Peach 150-1200
Persimmon 100 - 700
Pecan 150 - 1600
Plum 275 - 1000
Nectarine 150 - 1200
Quince 100 - 500
Pomegranate 100 - 300
Walnut 400 - 1500