The Tropical Fruit Forum
Citrus => Cold Hardy Citrus => Topic started by: Perplexed on October 13, 2018, 09:30:32 PM
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What are some relatively cold hardy in this tribe? Other than citrus, fortunella, and poncirus.
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Bael (Aegle marmelos) can tolerate temps down to 20F, see https://hort.purdue.edu/newcrop/morton/bael_fruit.html
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Yeah but like how about in the low teens and below?
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Atalantia glauca, sometimes named "Native Kumquat" or "Desert Lemon" from Australia
Probably not hardy to zone 7 though.
I might quickly mention Acronychia pedunculata here, which has been traditionally used as an ingredient in incense in China and Korea (adds a pleasant warm peppery amber wood and pine smell).
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Seems like the tribe is mostly subtropical, that's tough
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There is Severinia buxifolia (Chinese Box Orange), supposedly hardy to zone 8 (maybe only 8b).
Hybrids have been made with Citrus:
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000100021 (http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000100021)
Also quick mention to another only recently discovered rare species, Poncirus polyandra.
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Poncirus polyandra is not as hardy as trifoliata, or so I was told but I do not know how much it can take. The few people who have it do not want to risk their plants (yet).
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Florian, Poncirus polyandra is said to be a hybrid, as far as I know.
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P.polyandra is not a hybrid. But I can`t find the pdf right now.
I know of a plant at a german Botanic Garden where it is in open ground. It suffers much from the cold. Snow cover helps a lot.
I had several dieback at -6°C but the plant recovered. It is not very vigorous.
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Mikkell is correct, P.polyandra is not a hybrid.
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Yes.
> Poncirus polyandra is not as hardy as trifoliata, or so I was told but I do not know how much it can take. The few people who have it do not want to risk their plants (yet).
I shall try next winter.
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Yes.
> Poncirus polyandra is not as hardy as trifoliata, or so I was told but I do not know how much it can take. The few people who have it do not want to risk their plants (yet).
I shall try next winter.
And I shall follow your tests with great interest :). But Mikkel's remarks are not too encouraging.