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https://aroniainamerica.blogspot.com/2011/04/how-far-south-can-aronia-be-grown.html#:~:text=For%20aronia%2C%20the%20actual%20chill%20requirements%20have%20not,a%20plant%20is%20often%20expressed%20in%20chill%20hours.
https://extension.umd.edu/programs/agriculture-food-systems/program-areas/fruit-vegetable-production/alternative-crops/aronia
Several years of dormancy studies at the University of Maryland have revealed preliminary estimations on the southern range of all Aronia varieties which is around 1000 chill hours (using the dual temperature model).
https://raintreenursery.com/pages/growing-fruit-trees-aronia
The chill hour requirement of plants varies by species, by cultivar, and sometimes by the level of dormancy achieved. Where to Plant Your Tree Aronia need to be planted where they receive at least 8 hours of direct sunlight measured in early summer (late June to early August).
https://aroniainamerica.blogspot.com/2011/04/how-far-south-can-aronia-be-grown.html
Aronia plants need about 800 to 1,000 chilling hours. That is typically what the Davis area of California gets each year. But only 80 miles southwest of Davis, the winter temperatures are moderated by the Pacific Ocean.
https://www.starkbros.com/growing-guide/how-to-grow/berry-plants/aronia-berry-plants
Chill Hours for Fruit and Nut Trees There are two important factors in determining if a particular tree or plant will grow well in your part of the country. First, you must live within the recommended USDA Hardiness Zone and if you are planting a fruit or nut tree, you must determine if your area receives enough annual Chill Hours.
https://waldenheightsnursery.com/chilling-hours/
Chilling hours are generally not listed in the product pages of our website, but here are some helpful, though rough, guidelines: Fruit Crop Chilling Hours Required Apples 200–1,000 Blackberry 200–600 Blueberry 150–700 Aronia 400+ Saskatoon 1000+ Grape 100–600 Rhubarb 500+ Pear 400–900 Currants and Gooseberry 800+ Northern nuts 800+ Plum 400–700
https://healthline1.com/chill-hours-calculator-agroclimate
However ...Several years of dormancy studies at the University of Maryland have revealed preliminary estimations on the southern range of all aronia varieties which is around 1000 chill hours (using the dual temperature model).
https://gardeningsolutions.ifas.ufl.edu/plants/edibles/fruits/chill-hours.html
They need a dormancy period with a certain number of chilling hours, when the temperature drops below 45 degrees Fahrenheit. The exact number of chilling hours depends on the fruit tree variety, but it can be anywhere from a hundred to more than a thousand.
https://www.starkbros.com/growing-guide/article/chill-hours-for-fruit-and-nut-trees
Chilling requirements vary widely among varieties. Generally speaking, fruit and nut trees that require higher chill hours (800-1000) are better suited for cooler northern climates, while lower necessary chill hours (500 or less) are suited for warmer climates in the Southern region.
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