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Citrus Growers Forum Index du Forum -> Hardy Citrus (USDA zone 8 or lower)
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ilyaC
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Joined: 04 Sep 2009
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Location: France, 40km South of Paris

Posted: Thu 14 Jan, 2010 4:57 pm

Roberto,
It will be a real test for my in ground citruses in the spring.
Defreezing of the ground has started only today, after two weeks of cold and snow. And it is our second froze this winter.
I put some fleece cover in the coldest night but only on my citremon. The rest were open to elements.
I shall put some photos soon.

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Roberto
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Posted: Thu 14 Jan, 2010 6:09 pm

A short visit in my garden showed more or less total loss of foliage of all in ground citrus after -14°C and a week of permanent freeze. I have Citsuma, HamlinXFlying dragon, some Citrumelos, Trifeola, PoncirusXsunki mandarin and a whole sample of C. ichangensis. Now the question is: what will survive?
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Joined: 09 Mar 2009
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Location: Ukraine, Kiev, Crimea, Alushta

Posted: Wed 20 Jan, 2010 3:31 pm

ilyaC wrote:
I got -15.8C four nights ago. The local weather station registered even -17C.
http://fr.weather.com/weather/monthly-Melun-FRXX0061

This type of winter is happening once in 25-30 years here.
For the moment Ichangquat ( completely unprotected) is showing partial browning of leaves in upper branches, but spring is still very far.

Hello, Ilya!
Yes, -15,8C and maybe -17C, as Shtirlits would say, nobody was able to previse it. Of course,I hope your plants to hold on, to survive. I think, You stand a chance.
And it is very intriguing, what April is going to show us. And in Kyiv it has been also freezing this month, we have got about -18C, and it is amazing, but in Crimea on the South Coast there was no frost: we got 0îÑ several days-nights, but mostly +5Ñ, +12Ñ. However, 26/01/2010 will be by forecast about -10C.
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Lemandarangequatelo
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Posted: Fri 18 Feb, 2011 8:30 pm

Hello IlyaC and Roberto. This was a very interesting thread to read, very enjoyable. How are your plants doing now? IlyaC did your ichangquat survive? Roberto are your hardy citrus ok? Any pictures would be welcome.

IlyaC could you provide a link to where I can buy the ichangquat please? I tried to google Bernhard Voss but the site I found had pages missing and I couldn't find anywhere to buy the ichangquat.

Roberto could you provide links to where you bought your various hardy citrus please?

Thanks!
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ilyaC
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Posted: Sat 19 Feb, 2011 7:17 pm

Ishangquat has not flowered in the spring, But starting from July has several several periods of flowering. Last one occurred in October(picture)
There were dozens of immature fruits but they were damaged by -9C in the December. The winter here this year has been cold, but without records. For the moment all my hybrids look good.



Uploaded with ImageShack.us

Here is a link to B.Voss site:

http://www.agrumi-voss.de/citrus.htm

Ishangquat is listed as N8 on the Frosthartere Citrus page

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Lemandarangequatelo
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Posted: Sat 19 Feb, 2011 8:49 pm

Thank you for the update, link, and pic. I'm glad your hybrids are doing good, a pity about the fruits not surviving the winter.

It says on the B.Voss site the ichangquat takes -12C but you and others have observed it takes -16C? This is very encouraging. Am I right in thinking the ichangquat is the most cold hardy citrus plant other than the poncirus trifoliata?

There is also the ichangensis x trifoliata but I cannot find much information on this. The B.Voss site says it takes -12/-15C which is surprising because I would imagine it would be hardier than the ichangquat, given that it has poncirus rather than kumquat as a parent.
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Millet
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Posted: Sun 20 Feb, 2011 2:54 am

A peculiarity of C. ichangensis, and all of its hybrids, is that they all flower and fruit more freely if grafted onto the trifoliate orange rather than grown on their own roots. (Hardy Citrus For The Southeast) - Millet (695-)
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ilyaC
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Posted: Sun 20 Feb, 2011 9:59 am

Lemandarangequatelo,

Over the years I planted and killed many "hardy" citrus hybrids. It seems that fatal for them are different sudden weather fluctuations.
The cold tolerance reported in one climate and for short period of observation are very misleading.
For the moment, I have consistent not at all damage only for Ishangquat and Swingle 5star citrumelo. And of course poncirus.

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Lemandarangequatelo
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Posted: Sun 20 Feb, 2011 3:54 pm

IlyaC, thank you very much for the valuable information. The ichangquat and swingle 5 star citrumelo are now top of my list of next citrus plants to get. What's even better is that both of these have fruit that is reasonably tasty. Have you ever tried to cross breed ichangquat with swingle 5 star citrumelo? This sounds like a very interesting cross to do!
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ilyaC
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Posted: Sun 20 Feb, 2011 6:03 pm

Not yet, but it is in my plans for this spring.

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Lemandarangequatelo
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Posted: Mon 21 Feb, 2011 12:04 pm

This is awesome, if you have time to do it please keep us informed.
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Roberto
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Posted: Mon 21 Feb, 2011 12:30 pm

Lemandarangequatelo,

alas I am not as lucky as Ilya who lives near Paris. In Vienna we've had a serial of quite cold and damaging (at least to citrus) winters. Although most of my hybrids survived they froze down to the ground. The ongoing winter was a little bit milder but the problem is that most of the young upgrow of last summer will die back. My Citrumelos, Trifeolas and Citsumas will never reach more than 10inches...
There is one quite promising hybrid: PoncirusXSunki-mandarin and another one: Citsuma "Prague". Prague-scion survived last winter totally unprotected on a 1m high rootstock. And the nice thing about this Citsuma is, that the fruits are sweet and have no Poncirus-aftertaste (referring to Bernhard Voss). My plan for the future is to protect my citrus trees (merely against sun in winter) but not heat them.
Greetings from Vienna
Robert
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Lemandarangequatelo
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Posted: Mon 21 Feb, 2011 4:28 pm

Robert,

thank you very much for sharing your excellent information. I'm sorry to hear about the dieback on most of your citrus trees. I'm happy to learn about the two promising hybrids PoncirusXSunki-mandarin and Citsuma "Prague". I hope these hardier hybrids, and your new plan to protect your other citrus against the sun during winter, prove very successful for you.

I have now added PoncirusXSunki-mandarin and Citsuma "Prague" to my list of citrus trees to get along with the ichangquat and swingle 5 star citrumelo. In the future I will use them to try and make some new good tasting hardy hybrids.
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Joined: 09 Mar 2009
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Location: Ukraine, Kiev, Crimea, Alushta

Posted: Tue 11 Oct, 2011 4:43 pm

Dear Ilya, it will be interesting to know and probably to see how your Ichangquat is growing and fruiting now.Thanks.
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ilyaC
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Joined: 04 Sep 2009
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Location: France, 40km South of Paris

Posted: Tue 11 Oct, 2011 6:09 pm

Forward wrote:
Dear Ilya, it will be interesting to know and probably to see how your Ichangquat is growing and fruiting now.Thanks.


It has been flowering all the summer, even today I found three flowers . The fruits from late May bloom start to to show the yellow color.

ImagesTime.com - Free Images Hosting

ImagesTime.com - Free Images Hosting

Citrange Morton is still green:

ImagesTime.com - Free Images Hosting

as well as citrangequat Thomasville:

ImagesTime.com - Free Images Hosting


but Swingle5* is also turning to yellow:

ImagesTime.com - Free Images Hosting

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Ilya
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