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Messages - Zitrusgaertner

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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)

Citrus General Discussion / Re: Winter care
« on: February 15, 2022, 02:04:38 PM »
At what temperature do you keep your plants? Citrus does not grow if temperatures are lower than 12C (53,6F). If you don't have good light it is better to keep citrus trees cold. Betrween 0 and 5C (32 - 41F) I think it is not a good idea to carry the plants around.

Cold Hardy Citrus / Re: Citrumelo Nr. 82
« on: January 23, 2022, 03:37:44 PM »
thanks Mikkel, seems I have to regradt some of my Dunstans 😉, because I also see 5* better than Dunstan in taste.

5* is bad enogh! The bitterness is grave and long lasting and there is resin. Nearly as much as with my Poncirus.

Cold Hardy Citrus / Re: Hybrid Nin-Kat-MandarinXPoncirus
« on: December 15, 2021, 07:00:44 AM »
Is Nin Kat itself particularly hardy? I saw a plant in Eisenhut's garden in July.

I am not sure, but I think I mixed up Ninkat and Sunki. I think this is PTxSunki -US812 from seed.

Cold Hardy Citrus / Re: Hybrid Nin-Kat-MandarinXPoncirus
« on: December 13, 2021, 10:55:07 AM »
The fruit reached maturity by now.

Good fruity smell without poncirus note, juicy, acid,  bitter like calamondin, a little bit of internal oils sticking to the dents.

Thank you, Ilya. Looks very nice! Mine did not flower yet but is a very nice tree with dense round crown (high grafted on poncirus) Maybe this year!

Cold Hardy Citrus / Re: hybrids with precocious Poncirus
« on: November 30, 2021, 06:00:51 AM »
I noticed some strange incompatibility of precocious poncirus.
It can be grafted and successfully grown on standard poncirus roots, but  when  grafted to 5star citrumelo, grows several centimeters before dropping its leaves. I have such graft that is dormant already  for two years.


I have a precocious PT seedling that flowered in its second year but did not develop leaves in the following years. It is now 5 years old, still alive but did not grow at all. It is still on its own roots.

Cold Hardy Citrus / Re: new thoughts on breeding hardier citrus
« on: November 30, 2021, 05:46:18 AM »
Have you ever thought of Ichang Papeda? Is it suitable for your climate zone?
Ichang Papeda grows much better than Poncirus and some flower after 3 years, but not all.
Poncirus grows so unspeakably slowly that I am already wondering whether it is at all suitable for my climate.


there is quite a lot of variety with PT seedlings. Some are vigorous others not at all. You have to select the vigorous ones.

Cold Hardy Citrus / Re: Hamlin x Flying Dragon
« on: November 30, 2021, 05:06:12 AM »
I am quite sure that my seeds came from Andi Voss. He shared what he had got from Riverside with some other people. One of them was me  ;)

Cold Hardy Citrus / Re: yellow branches on poncirus
« on: October 15, 2021, 02:34:09 PM »
Yellow twigs are a sign of some kind of lack of nutrients.

Cold Hardy Citrus / Re: Yuzu... my new obsession!
« on: October 15, 2021, 02:24:31 PM »
Yuzu Nr 3 is said to be the best and most frost hardy but I think the range of variation is not that big.

It seems that there are F2-Citrumelos with mono-leaves. The discription of taste does not fit a F1-Citrumelo  ::)

Cold Hardy Citrus / Re: Grafting poncirus and flying dragon
« on: July 30, 2021, 09:47:33 AM »
Okay, but I have never noticed poncirin taste with any high grafted citrus. Anyway I am wondering how much high grafting pushes up frost hardiness.

No, 899A lost its fruits after heavy blooming. This year there are no flowers at all. I have to recraft 899A and 899J. The plants are very old (more than 20 years) and roots are not good anymore. 899J did not bloom aswell.

Tedburn, maybe you could make another try with high grafted plants. Let's say 80 - 100cm poncirus stem under the scion. I was successful with this concept. And sun protection is very important.

Citrus General Discussion / Re: Rootstock bark split
« on: June 15, 2021, 05:35:50 AM »
and keep it dry!

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: June 02, 2021, 03:50:00 AM »
Has anyone crossed Poncirus+ and Changsha yet?

Has anybody used PT+ for any new cross yet? There are a lot of interesting things that could be tried. PT+ X Grapefruit Enzo for example. Enzo has a remarkable hardiness and its fruits are quite frostresistant aswell.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: May 27, 2021, 10:09:46 AM »
Very interesting. Did you apply any sun protection? My opinion is, that more citri are killed by sun than by frost alone. They are all on own roots by now, are they? Du you plan to craft some on PT?

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: May 26, 2021, 05:51:21 AM »

TaiTri and 5* are more hardy than the most tender Segentranges and less hardy than the hardiest segentranges.

Kumin, what are the hardiest Segentranges?

Of my garden-citri Ichangensis IVIA from seed, Citrumelo 5*, Citsuma Prague and Citrandarin US812 (from seed) are about equal in hardiness. Yuzu3 survived the last winter without any dieback or even loss of foliage. Citrange Morton (on Swingle Citrumelo) and some yuzu from Bernhard Voss died. Most likely my fault caused by wrong protection which allowed the winter sun to heat up the shelter and broke dormancy. Morton was not well established and Swingle might not be the right rootstock. Tmin was -10 to -12. Not really low in fact.

That is true, however I lack the space for that, and they're pretty pricey here too, for that price I had a proper glass greenhouse. However I really wished mine was a bit higer, temperature management is difficult at times because the greenhouse's roof height is 2.5m ( = 98.4 inch or so) and it really should be 20% higher at least. But then I'd have to choose a much bigger greenhouse which is wider and longer and again I was not allowed that much space in my garden :(
I am well aware that the large industrial size greenhouses are heaven in terms of temperature management, even without special equipment to regulate it automatically. But that's something I can only dream of.

I dream of going professional with my citrus production  ;)

I was talking about a professional greenhouse with at least 1000m better 3000m No hommade version. The more volume cou can enclose the better will get the climate in your greenhouse. With a professional foil greenhouse you can widely open the sidewalls.  ;)

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