Cold-hardy citrus is

citrus ''Citrus'' is a genus of flowering trees and shrubs in the family Rutaceae. Plants in the genus produce citrus fruits, including important crops such as oranges, mandarins, lemons, grapefruits, pomelos, and limes. ''Citrus'' is nativ ...

with increased

frost Frost is a thin layer of ice on a solid surface, which forms from water vapor that deposits onto a freezing surface. Frost forms when the air contains more water vapor than it can normally hold at a specific temperature. The process is simila ...

tolerance and which may be cultivated far beyond traditional citrus growing regions. Citrus

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

and

citrus hybrids Citrus taxonomy is the botanical classification of the species, varieties, cultivars, and graft hybrids within the genus ''Citrus'' and related genera, found in cultivation and in the wild. Citrus taxonomy is complex and controversial. Cultiva ...

typically described as cold-hardy generally display an ability to withstand wintertime temperatures below . Cold-

hardy Hardy may refer to: People * Hardy (surname) * Hardy (given name) * Hardy (singer), American singer-songwriter Places Antarctica * Mount Hardy, Enderby Land * Hardy Cove, Greenwich Island * Hardy Rocks, Biscoe Islands Australia * Hardy, ...

citrus may be generally accepted 'true' species (e.g.

Satsuma mandarin ''Citrus unshiu'' is a semi-seedless and easy-peeling citrus species, also known as the satsuma mandarin or Japanese mandarin. During the Edo period of Japan, kishu mikans were more popular because there was a popular superstition that eating '' ...

kumquat Kumquats ( ), or cumquats in Australian English, are a group of small, angiosperm, fruit-bearing trees in the family Rutaceae. Their taxonomy is disputed. They were previously classified as forming the now-historical genus ''Fortunella'' or plac ...

) or hybrids (e.g.

citrange The citrange (a portmanteau of ''citrus'' and ''orange'') is a citrus hybrid of the sweet orange and the trifoliate orange. The purpose of this cross was to attempt to create a cold hardy citrus tree (which is the nature of a trifoliate), wi ...

) involving various other citrus species. All citrus fruits are technically edible, though some have bitter flavors often regarded as unpleasant, and this variability is also seen in cold-hardy citrus fruits. Those listed as "inedible fresh" or "semi-edible" can (like all citrus) be cooked to make

marmalade Marmalade (from the Portuguese ''marmelada'') is a fruit preserves, fruit preserve made from the juice and peel of citrus fruits boiled with sugar and water. The well-known version is made from bitter orange. It also has been made from lemons ...

Varieties

Varieties of true citrus considered cold-hardy, ordered from most to least hardy:

Interspecific hybrids

Interspecific hybrid varieties considered cold-hardy, ordered from most to least hardy:

References

External links

''The Citrus Industry'' Volume 1 & 2
{{citrus Citrus Citrus hybrids Lists of plants Gardening aids

Varieties

Interspecific hybrids

See also

References

External links