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https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car#:~:text=Nut%20and%20fruit%20trees%20%28except%20for%20citrus%29%20need,the%20production%20of%20leaves%20may%20also%20be%20delayed.
https://www.groworganic.com/blogs/articles/chill-hours-what-are-they-how-do-i-count-them-and-why-do-my-fruit-trees-car
Chill Hours Are Important to Fruit Trees As you know, trees cannot walk away if they don't like the weather -- they have to stay and suffer through it. Nut and fruit trees (except for citrus) need a specific number of chill hours each winter to regulate …
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=16468
The necessary signal strength varies between species, but is officially referred to as “chill hours”, or vernalization, when the temperature stays between 32°-45°F. The hormone responsible for dormancy breaks down in this range, allowing buds to …
https://orchardnotes.com/2021/01/10/what-are-chill-hours-and-why-do-they-matter/
TL;DR Version: fruit trees need a certain number of hours’ worth of low temperatures over the winter period in order to grow back strongly in spring. Knowing the ‘chill requirement’ of a fruit species or cultivar helps gardeners and orchardists avoid …
https://www.davewilson.com/home-garden/fruit-variety-recommendations/fruit-tree-chilling-requirement/
1. In fall, deciduous fruit trees lose their leaves and enter a dormant state in order to survive winter. To end dormancy, bloom and set fruit they require a certain amount of winter cold (their “chilling requirement”) followed by a certain amount of heat. Chilling requirements vary widely among varieties.
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