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The chilling requirement of a fruit is the minimum period of cold weather after which a fruit-bearing tree will blossom. It is often expressed in chill hours, which can be calculated in different ways, all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures. [1] [2]
Cold-hardy citrus is citrus with increased frost tolerance and which may be cultivated far beyond traditional citrus growing regions. Citrus species and citrus hybrids typically described as cold-hardy generally display an ability to withstand wintertime temperatures below −5 to −10 °C (23 to 14 °F).
The low latitude and often stable weather in Florida, the Gulf Coast, and southern Arizona and California, are responsible for the rarity of episodes of severe cold relative to normal in those areas. The warmest zone in the 48 contiguous states is the Florida Keys (11b) and the coldest is in north-central Minnesota (2b).
major but temperature usually too cold T Red maple [2] Acer rubrum: 1 5 no feral major but temperature usually too cold for bees to fly T Ohio buckeye [3] Aesculus glabra: 4 5 no feral minor S Shadbush: Amelanchier arborea: 4 5 no feral minor, or major depending on location and weather. S, T Devil's walkingstick: Aralia spinosa: 7 8 no feral ...
Like the closely related Washingtonia filifera (California fan palm), it is grown as an ornamental tree. Although very similar, the Mexican washingtonia has a narrower trunk (which is typically somewhat wider at the base), and grows slightly faster and taller; it is also somewhat less cold hardy than the California fan palm, hardy to about −8 ...
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Climate Central’s “2023 Winter Package” graphic shows the average change in winter temperature between December and February, from 1970 to 2022.
The annual temperature in Japan, for example, has risen at a rate of 0.124 °C per decade from 1898 to 2019, influencing fruit tree flowering times and potentially leading to a physiological disorder known as "flowering disorder" in Japanese pear, which may result from abnormal flowering or dormancy or both. [4]