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Topics - tedburn

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Cold Hardy Citrus / Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« on: April 09, 2021, 04:59:33 PM »
In summer 2020 I planted a lot of assumed frosthardy citrus varieties in my garden in ground. Due to the plants have been not so big I hoped to get a mild winter, but counted with the worst. And the winter got worse, we got 4 days and nights enduring frost down to 3,2 F ( - 16 C) and during the days frost with 100% full sunlight.
Heavy test for my citrus. Then from 20.2. it got warmer, but always change a few days warm, followed by colder days with night frost. So I show you the result after the severe winter. Hope it can help you to get more information of cold hardiness of citrus varieties 😋.
Regards Frank

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Citrus General Discussion / Grafting on 6 week old seedlings possible ?
« on: January 30, 2021, 02:24:16 AM »
I have a lot of different 4-6 week old citrus seedlings and they are growing nice. So I thought if in this age grafting heals faster. The more difficult handling due to the only 8 to 10 cm high seedlings would be the price. If my theory of faster healing is true.
I will try it the next days. But if everyone has experience, it would be interesting to hear about ?
Best regards Frank

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Cold Hardy Citrus / tetraploid seedlings or plants - how to recognize
« on: January 24, 2021, 04:10:54 AM »
I read a few articles about some advantages of tetraploid citrus, but I couldn' t find out yet, how I can recognize if a seedling or a plant has tetraploid genetic.
Are there citrus species which are as default tetraploid or are there exterial signs e.g. as leaveshape, smell or other exterial attributes ?
Very interested to learn more about ;).

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Cold Hardy Citrus / Cross of coldhardy citrumelo and quite coldhardy pomelo
« on: December 28, 2020, 03:26:00 PM »
Quote from: Ilya11 on May 01, 2017, 04:12:07 AM
Do we know what happened to this interesting hybrid?
I has not be able to find any further information on it.
In  leaf freeze resistance tests it was shown to have a similiar or even better hardiness than US119.

http://hortsci.ashspublications.org/content/33/4/744.full.pdf

I think this is an interesting question, if it should be possible to cross a quite cold hardy pomelo like e.g.bloomsweet with an very coldhardy citrumelo/Citrange like 5*, Dunstan or  Morton, to get better and bigger fruit than Citrange/citrumelo and perhaps little less cold hardiness - did you meanwhile get an answer Ilya ? Anyone else or is someone already working at this subject ?
best regards Frank




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Cold Hardy Citrus / HRS 899 experiences ?
« on: December 20, 2020, 04:55:45 AM »
Hello, inspired by an older post of usirius to getting jam out of HRS 899 and the conclusion  that edibility and jam seems to be good I wondered which clone of HRS 899 this was and what expiriences have been made with HRS 899 in the Forum and especially I would be interested in HRS 899A, the clone I planted this year in ground.
Thanks in advance, Frank

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Citrus General Discussion / Holes in Citrusleaves with yellow brown ring ?
« on: December 09, 2020, 10:40:02 AM »
Hello Citrusexperts,
discovered on a new plant holes in the leaves with yellow and brown surrounding. Separated it now out of the greenhouse, but would like to know what it is or if it is something that could spread to my other plants ?
Everyone who had this or who knows what this is ?
Thanks for your advice.
Best regards Frank






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Cold Hardy Citrus / How to overwinter potted Poncirus
« on: November 22, 2020, 12:34:08 PM »
Hello Citrus Experts,
I have some smaller Poncirus in pots which I want to take as rootstock for grafting next year.
The pot diameters are about 8 cm in diameter and the plants are about 20 to 30 cm high.
Now I ask me if they loose hardiness if I overwinter them in my greenhause which I keep
between 0 and 1 Degree Celsius (32 and 33,8 degree Fahrenheit).
Otherwise I fear that the roots of the Poncirus get freeze damaged if I let them unprotected on my veranda.
Similar question concerning some potted cold hardy plants as Thomasville, Bloomsweet, Ichang Lemon and Changsha mandarin with pot diameter about 15 cm and hights of about 50cm, which I want to plant in ground next early summer. Do they loose hardiness if they go to the greenhouse in Winter ?
Currently they still stand beside the greenhouse with fleece protection.
Thanks for your experiences.
Best regards Frank


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