The Tropical Fruit Forum

Citrus => Cold Hardy Citrus => Topic started by: Perplexed on October 13, 2018, 09:30:32 PM

Title: Citreae tribe hardiness
Post by: Perplexed on October 13, 2018, 09:30:32 PM

What are some relatively cold hardy in this tribe? Other than citrus, fortunella, and poncirus.

Title: Re: Citreae tribe hardiness
Post by: Dimitry Fisher on October 14, 2018, 01:05:17 AM

Bael (Aegle marmelos) can tolerate temps down to 20F, see https://hort.purdue.edu/newcrop/morton/bael_fruit.html

Title: Re: Citreae tribe hardiness
Post by: Perplexed on October 14, 2018, 01:12:00 AM

Yeah but like how about in the low teens and below?

Title: Re: Citreae tribe hardiness
Post by: SoCal2warm on October 14, 2018, 01:19:44 AM

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).

Title: Re: Citreae tribe hardiness
Post by: Perplexed on October 14, 2018, 02:12:26 AM

Seems like the tribe is mostly subtropical, that's tough

Title: Re: Citreae tribe hardiness
Post by: SoCal2warm on November 05, 2018, 10:36:04 PM

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.

Title: Re: Citreae tribe hardiness
Post by: Florian on November 06, 2018, 12:54:49 PM

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).

Title: Re: Citreae tribe hardiness
Post by: Zitrusgaertner on November 07, 2018, 09:26:30 AM

Florian, Poncirus polyandra is said to be a hybrid, as far as I know.

Title: Re: Citreae tribe hardiness
Post by: mikkel on November 07, 2018, 12:00:04 PM

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.

Title: Re: Citreae tribe hardiness
Post by: Millet on November 07, 2018, 03:24:42 PM

Mikkell is correct, P.polyandra is not a hybrid.

Title: Re: Citreae tribe hardiness
Post by: Sylvain on November 08, 2018, 10:06:33 AM

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.

Title: Re: Citreae tribe hardiness
Post by: Florian on November 08, 2018, 02:54:12 PM

Quote from: Sylvain on November 08, 2018, 10:06:33 AM

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.