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Messages - Zitrusgaertner

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Cold Hardy Citrus / Re: Hybrid Nin-Kat-MandarinXPoncirus
« on: May 23, 2023, 08:53:52 AM »

No, never been there. Never been to the US either.Why?
Our professional base ball tea, The Cincinnati reds, referred to them as being in Zinzinnati.  Our city is of German heritage and misspelling it with Z's is supposed to give it a German twist.  With your name of Zitrus.... I though you may be from Cincinnati.
In June I will visit the US and Canada for the first time in my life.

Cold Hardy Citrus / Re: Hybrid Nin-Kat-MandarinXPoncirus
« on: May 20, 2023, 03:42:12 PM »
Have you ever been to Zinzinnati, Ohio

No, never been there. Never been to the US either.Why?

Cold Hardy Citrus / Re: Ichang Papeda from seed?
« on: May 19, 2023, 06:42:18 AM »
I would say it does not as its variebility indicates. But cross pollination is probably not that high in the wild because most citrus types cannot survive where C. ichangensis growth.

The stability of wild species is sometimes somewhat miraculous. We have in my area many wild cherry trees (Prunus avium) and also many cultivated cerry trees (also Prunus avium). They definitely hybridize with each other and you find many intermediate forms. Yet the wild form clearly dominates in forests. Why? Probably because the birds prefer it because its fruits are smaller and better to eat for them. And a second reason may be that the wild form does not vast its energy for big fruits so that it performs better in competition with other trees or in poor soil.

I do not know what it exactly is that give stability to wild C. ichangensis as a species. There may be some factors. But it seems also to be true that "stability" is relative. Therefore the variation within the species.

I think Ilya could shed some light on that.

Cold Hardy Citrus / Re: Hybrid Nin-Kat-MandarinXPoncirus
« on: May 19, 2023, 06:37:51 AM »
This spring my PTxSunki has become crazy with flowers

Mine, the mother plant, blooms for the first time at last. But there are hundereds of flowers. Quite tiny yet because of the very low temperatures but I am glad. How was this fruit? Awful?

What's wrong with swingle or Dunstan? Dunstan is probably the most edible of the cold hardy citrus. I'm more interested in hlb tolerance though. Swingle has really good cold tolerance and almost edible fruit.
I would not state that Swingle had edible fruits. Dunstan is slightly better but still not edible. The best citrumelo seems to be stock number 82 at Reto Eisenhut's vivaio in Switzerland. I did not have fruit yet but everybody who could compare says so. Trifolis is also quite nice but seems to be F2 and is probably less hardy than F1 Citrumelo. But in fact Swingle is not that hardy. 5* ist much better.

Cold Hardy Citrus / Re: Macrophylla Vs FD vs C-35 root stock
« on: May 19, 2023, 06:24:23 AM »
rooted cuttings bloom immediatly.

Cold Hardy Citrus / Re: Poncirus hybrid crosses
« on: May 02, 2023, 03:40:41 PM »
This one seems promising. It's cold hardy.

whatever "cold hardy" means. Some sources say Cara Cara was the most cold hardy orange. Blood orange"Montagne corse" is also said to be "frost hardy". The limit seems to be -10.

Cold Hardy Citrus / Re: The most hardy non trifolate citrus tree
« on: April 16, 2023, 03:50:26 PM »
yes but Yuzu is not edible

Strange statement. Yuzu is highly rated and quite expensive citrus fruit in Japan and Europe. I would prefer it to chimera "Prague" which brings not very tasty mandarin-like fruits. If ever. My 8 years old, 2m high tree never kept a fruit but drops them at the size of a pea. Cannot recommend Prague.

Cold Hardy Citrus / Re: The most hardy non trifolate citrus tree
« on: April 16, 2023, 03:43:56 PM »
Xie shan is still going strong in 7A

But you keep it in a cold frame, do you?

Citrus General Discussion / Re: Variegated sport on my Cara Cara
« on: March 29, 2023, 08:21:58 AM »
Last year towards the end of the season when the late summer flush of new growth started I got a variegated sport show up on my Cara Cara.
Now that spring is here it has blossoms and is setting fruit on the variegated branch, they look like they will have the variegation also, I'm excited to see what they look like.

I think you should graft this sport on a rootstock to keep it stable. Otherwise it probably won't last.

Cold Hardy Citrus / Re: Yuzu
« on: March 03, 2023, 03:07:35 PM »
There was a long discussion about the taste of Yuzu in Citrus Growers forum: Most Europeans valued Yuzu very much while Americans were mostly not positively impressed. The reason seems to be that the Yuzu varieties in Europe are not the same as in the States.

I think there is much difference between old world culinary tradition as well as openness to new taste and preferences in the US. Yuzu-rind is not bitter at all  ;)

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 24, 2023, 05:37:09 PM »
........... survived a low temperature of -12F. The survivors .......

-12 is -24,44C that's lower than some Poncirus trees would survive. Are you really sure?

Cold Hardy Citrus / Re: Zygotic Poncirus hybrids
« on: January 29, 2023, 05:18:51 AM »
Nice table! Data of Poncirus certainly depends on the cultivar. Poncirus can have 100% zygotic seeds or hardly 1%.

Never heard of 100% zygotic Poncirus

Cold Hardy Citrus / Re: shiranui sumo citrus
« on: January 29, 2023, 05:17:20 AM »
Shiranui (Dekopon) is said to be hardy down to -10C. I have a tiny plant in a pot and cannot tell from my own experience

Cold Hardy Citrus / Re: Citrumelo
« on: January 16, 2023, 11:34:05 AM »

I think there are some members which have experiences with coldhardy citrus, but to receive answers you should ask more detailed what you are interested in. I e.g. I have a Yuzu since 3 winters in ground, froze to earth in winter after a low of - 15 C and has now recovered again or a Dunstan citrumelo seedlings two year old in ground took -13 C this winter - all survived, some with slight damages, others with none, depending on genetics and microclimate of place.

one thing I personally observed was, that C. ichangensis showed much more hardiness on its own roots than grafted on Poncirus. In direct comparison all grafted specimen died from cracks and all seedlings on its own roots survived with leaveloss. under exactly the same conditions. I will test yuzu on its own roots in future.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 13, 2023, 11:47:02 AM »

I guess the fruit size will improuve with the age.
Below are the fruits from my 20 years old tree harvested today. The season was hot, 12 Brix, practically no perceptible internal oils, good lemonade when diluted three fold.


Was that the fruit of your original 5* or of some improved seedling?  My 5* fruits have always a very long lasting bitter aftertaste. Even if they get somewhat sweet after a hot summer. Dunsten had a better taste. I used the juice.

Cold Hardy Citrus / Re: Zygotic Poncirus hybrids
« on: January 13, 2023, 11:36:56 AM »
Ilya sent me some Poncirus+ seeds two years ago. There was some variation in the seedlings. And I would say there were also tetraploid seedlings. It is difficult though to count the exact number of zygotic seedlings. Most look too similar. They can be zygotic or not.

Batumi Citrumelo has zygotic seeds at least some at least when the right pollen is used. Batumi Citrumelo has a very good taste. But it is sour.

your batumi CM comes from ADAVO?

Cold Hardy Citrus / Re: Hamlin x Flying Dragon
« on: January 10, 2023, 11:21:17 AM »
Finally this year there is one fruit hanging. I missed  its flowers in the spring.

Ilya, did your HamlinXFD-Fruit get ripe?

Cold Hardy Citrus / Re: My citrus collection [EU - Antwerp]
« on: January 09, 2023, 11:11:17 AM »
I have Kabosu from the budwood that I got from Roberto. The leaves are less round and have some suspicious wrinkles.

Ilya, can you remember, when did I send you this budwood? I think it came from a plant I have lost in the meantime. Originally from a Citrus-friend from Germany. Most likely it is not from Adavo (but I do nor know his source)

Cold Hardy Citrus / Re: new thoughts on breeding hardier citrus
« on: August 24, 2022, 02:38:16 PM »
CRISPR/Cas will help  ;D

Cold Hardy Citrus / Re: Decent germination of "large fruited Poncirus"
« on: August 22, 2022, 04:15:40 PM »
No poncirus but a hybrid.

I suppose FA5 is less hardy than Morton. Why did you choose this rootstock?

Cold Hardy Citrus / Re: new thoughts on breeding hardier citrus
« on: May 25, 2022, 03:15:53 PM »
Your yuzu is on its own roots or grafted?

which will have fruits with earlier maturity, if all works well - we' ll see 😅

Why do you think so?

Cold Hardy Citrus / Re: U.S. 119...who is growing it?
« on: April 06, 2022, 05:14:00 AM »
Hmmm .... really "in some kind of english" :-) :-) :-) :-)  The automatic translation is totally insane.

All are grafted plants.

I do not know. Perhaps full dormancy of plants without interruption. From the beginning of November until the middle of February, the garden is completely sunless. In this period, the sun's rays will not reach even a minute over the surrounding houses.

Occasionally, the flowers look like roses. The appearance of the USA119 is very irregular.

I am with you: wintersun is a killer. If there is no full sun protection you can forget all stories about hardyness. One of my yuzus was killed by morning sun. Lowest was -6 or -7C!! The one in the shade is not damaged at all and Hanayuzu which was hit by evening sun has some cracks but will survive (hopefully)

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