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Messages - Zitrusgaertner

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1
I believe it is uncertain if the Eremolemon is a hybrid with (meyer) lemon, some sources think it's with lemon, some think it's with pomelo.
[/quote]

If you crush the leaves of eremolemon you will smell it is Meyer Lemon

2
Cold Hardy Citrus / Re: Yuzu as a rootstock
« on: January 27, 2024, 01:10:43 PM »
[...]yuzu is attractive to me for be very fast growing when given the right conditions, namely warm days and nights and plenty of moisture and fertilizer. My loft apartment provides plenty of heat in the summer and I was able to get a meter and a half of growth on a tree in one summer.

Please keep in mind that fast growing induced by a lot fertilizer limits the cold hardiness of citrus plants and plants in general.

3
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: December 12, 2023, 05:55:15 AM »
All HRS 899 are offspring of US852 or another hybrid with Changsha x Poncirus parentage.

Hi Mikkel,
I don't think 899 F2-series has US852 parentship. Otherwise Bernhard would have called it 852A - K. As far as I know 852 does not give zygotic embryos. Or only few. Whereas 899-seeds were all zygotic. As far as I can remember Bernhard was donated some fruits but was not allowed to take cuttings.

4
Ilya,
are Dunstan friuts better than 5 Star-fruits? And do you know #82 from Eisenhut aswell?

Best Regards
Robert

5
Cold Hardy Citrus / Re: 2023 USDA Plant Hardiness Zone Maps Out
« on: November 22, 2023, 09:40:24 AM »
I am in Colorado. I was traditionally in zone 5B and am still in 5B.  No global warming in Colorado.
Don't rely on that!

Austria has +3°C on an average and summers get dryer and dryer.

6
Cold Hardy Citrus / Re: IchangensisXSinensis from B.Voss
« on: November 22, 2023, 09:37:20 AM »
There is an somatic hybrid (fusion of protoplasts) of Ichangensis X sinsensis and a normal cross IxS. The somatic hybrid resembles oranges very much.

7
Cold Hardy Citrus / Re: My citrus collection [EU - Antwerp]
« on: August 11, 2023, 09:03:46 AM »
It may be a phosphorus deficiency.  Tomatoes look like that when there is insufficient phosphorus.  In any case use a water soluble fertilizer and spray with trace minerals for citrus.

 ??? NO! Healthy lemons, ichang papeda and their hybrids show this phenomenon. Nothing to do with phosphorus defeciency which can rarely be seen with citrus. Citrus do not like phosphorus so there nearly always is more than citrus plants need.

8
Cold Hardy Citrus / Re: My citrus collection [EU - Antwerp]
« on: July 26, 2023, 11:18:06 AM »
I have Kabosu from the budwood that I got from Roberto. The leaves are less round and have some suspicious wrinkles.







My Kabosu has died in the meantime. What ever it was this plant from Adavo was not healthy.


9
Cold Hardy Citrus / Re: Rough lemon cold hardiness?
« on: June 16, 2023, 01:44:24 PM »
Other than meyer which is cold tolerant because it's not actually a pure lemon.

Rough Lemon is not a pure lemon either.

10
Cold Hardy Citrus / Re: Rough lemon cold hardiness?
« on: June 06, 2023, 08:23:02 AM »
Anyone know the zone hardiness of Rough Lemon offhand? I just realized I have no clue, and a cursory google search has been very unhelpful.

Figured I'd ask the pros.

9b. C X jambhiri is not hardy at all.

11
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?
[/quote]
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.
[/quote]
In June I will visit the US and Canada for the first time in my life.

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

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

13
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.

14
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?

15
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.

16
Cold Hardy Citrus / Re: Macrophylla Vs FD vs C-35 root stock
« on: May 19, 2023, 06:24:23 AM »
rooted cuttings bloom immediatly.

17
Cold Hardy Citrus / Re: Poncirus hybrid crosses
« on: May 02, 2023, 03:40:41 PM »
This one seems promising. It's cold hardy.

https://www.oscartintori.it/en/prodotto/otaheite-orange/

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°.

18
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.

19
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?

20
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.

21
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: https://citrusgrowersv2.proboards.com/thread/196/yuzu-taste. 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  ;)

22
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 24, 2023, 05:37:09 PM »
........... survived a low temperature of -12°F. The survivors .......

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

23
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

24
Cold Hardy Citrus / Re: shiranui sumo citrus
« on: January 29, 2023, 05:17:20 AM »
Shiranui (Dekopon) is said to be hardy down to -10°C. I have a tiny plant in a pot and cannot tell from my own experience

25
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.
[/quote]

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.
Roberto

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