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https://ugaurbanag.com/blueberry-chill-hours-what-are-they/
Chill hours are the number of hours of winter temperatures 45 degrees F and below. If blueberry plants do not receive the adequate amount of chilling, bloom and leaf development can be late and erratic. This can result in a lackluster harvest. To sum it …
https://www.groworganic.com/blogs/articles/find-your-thrill-with-blueberry-chill-hours
Chill Hours are Important to Blueberries As you know, blueberry bushes cannot walk away if they don't like the weather -- they have to stay and suffer through it. Blueberries need a specific number of cold hours each winter to regulate their growth. If a blueberry bush doesn't experience enough cold in the winter the flower buds might not open at all in spring, or they might open unevenly. Okay, you're …
https://foodgardening.mequoda.com/articles/chill-out-blueberry-chill-hours/
Young blueberry plant during a frost. One important consideration when choosing the type of blueberry for your garden is chill hours. A chill hour is an hour below 45 degrees (F) during winter. A plant’s chill hour requirement is what the plant needs in order to stay dormant during winter. Flower buds on the plant or even the canes can be damaged or killed by low temperatures that come too soon.
https://blog.bofarmsltd.com/blueberry-plants-chilling-requirements-for-blueberry-production/
Depending on the variety, blueberry plants need between 150 and 2,000 hours of exposure to temperatures from 35 [degrees] F to 45 [degrees] F are needed to meet the plants chilling requirement and for growth resumption and bud-break in the spring.
https://ezinearticles.com/?Blueberry-Plants---Chilling-Requirements-for-Blueberry-Production&id=6027066
Depending on the variety, blueberry plants need between 150 and 2,000 hours of exposure to temperatures from 35 [degrees] F to 45 [degrees] F are needed to meet the plants chilling requirement and for growth resumption and bud-break in the spring.
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=23199
Chill hours are defined as hours less than 45°F but above 32°F. If a blueberry bush doesn't experience enough chill hours in the winter, the flower buds might not open at all in spring, or they might open unevenly. In either case, fruit production will be reduced. We have found the best resource for calculating chill hours is the Chill Calculator on the UC Davis Fruit and Nut Research and Information …
https://www.fallcreeknursery.com/home-gardeners/blueberries-demystified
Most “High Chill” varieties require: 800-1,000 Chill Hours. Most “Low Chill” varieties require: 150-800 Chill Hours. Once you have an idea of the number of chill hours in your region, you’ll know if you should select from the Northern or Southern Highbush family of varieties which are …
https://southernlivingplants.com/planting-care/berry-important-pollination-chill-hours-and-plant-food-3/
Chill hours are usually calculated as the amount of hours below 45 degrees Fahrenheit. For instance, our blueberry selections are chosen for a mid-range chill hour requirement of 500-550 hours, which correlate to good production throughout USDA Zones 7-9.
https://www.burpee.com/fruit/blueberry-plants/blueberry-the-southern-collection-prod003239.html
The best varieties for Southern climates. This collection offers 90 days of harvest from three southern highbush blueberries with low chill requirement: 'Misty' (300 chill hours), 'Jewel' (200 chill hours) and 'Sunshine Blue' (150 chill hours).
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