Question:
Chilling requirement for plum (Japanese)
Chilling requirement for plum (Japanese)
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Apple (High Chill) $>$ European Plum $>$ Japanese Plum $>$ Low Chill Peach/Pear. This hierarchy helps in remembering chilling ranges.
Updated On: Aug 13, 2026
- 200 - 300 hours
- 400 - 500 hours
- 700 - 1000 hours
- 1200 - 1500 hours
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Temperate fruit trees enter a period of rest (dormancy) during winter to survive freezing temperatures. To break this dormancy and resume normal growth, flowering, and leafing in spring, the buds must be exposed to a specific amount of "chilling" (temperatures usually between 0$^{\circ}$C and 7$^{\circ}$C). This is measured in "Chilling Hours."
Step 2: Detailed Explanation:
Plums are generally classified into two groups: European plums (Prunus domestica) and Japanese plums (Prunus salicina).
Japanese plums are generally better adapted to slightly warmer temperate climates than European plums and thus have a lower chilling requirement. However, "lower" is relative to European varieties which may require 1000+ hours.
For Japanese plums, the standard chilling requirement typically ranges between 700 and 1000 hours. If these hours are not met, the tree exhibits "delayed foliation," where bud break is erratic, flowering is poor or absent, and the fruit set is extremely low.
In India, Japanese plums are successfully grown in the mid-hill regions of the Himalayas (Himachal Pradesh, Uttarakhand, and J&K) where the winter provides sufficient chilling. Some specialized "low-chill" varieties exist that can fruit with only 300-400 hours (like Santa Rosa), but for the general category of Japanese plums in a standard temperate environment, the 700-1000 hour range is the accepted scientific norm for healthy commercial production.
Step 3: Final Answer:
The chilling requirement for Japanese plum is optimally identified as 700 - 1000 hours.
Temperate fruit trees enter a period of rest (dormancy) during winter to survive freezing temperatures. To break this dormancy and resume normal growth, flowering, and leafing in spring, the buds must be exposed to a specific amount of "chilling" (temperatures usually between 0$^{\circ}$C and 7$^{\circ}$C). This is measured in "Chilling Hours."
Step 2: Detailed Explanation:
Plums are generally classified into two groups: European plums (Prunus domestica) and Japanese plums (Prunus salicina).
Japanese plums are generally better adapted to slightly warmer temperate climates than European plums and thus have a lower chilling requirement. However, "lower" is relative to European varieties which may require 1000+ hours.
For Japanese plums, the standard chilling requirement typically ranges between 700 and 1000 hours. If these hours are not met, the tree exhibits "delayed foliation," where bud break is erratic, flowering is poor or absent, and the fruit set is extremely low.
In India, Japanese plums are successfully grown in the mid-hill regions of the Himalayas (Himachal Pradesh, Uttarakhand, and J&K) where the winter provides sufficient chilling. Some specialized "low-chill" varieties exist that can fruit with only 300-400 hours (like Santa Rosa), but for the general category of Japanese plums in a standard temperate environment, the 700-1000 hour range is the accepted scientific norm for healthy commercial production.
Step 3: Final Answer:
The chilling requirement for Japanese plum is optimally identified as 700 - 1000 hours.
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