Citrus > Cold Hardy Citrus

Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F

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kumin:

--- Quote from: tedburn on December 20, 2022, 11:25:01 AM ---
--- Quote from: kumin on December 20, 2022, 10:59:57 AM ---
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A few F Citranges survived -11,8 F ( -24,5 C) in January 2019.



--- End quote ---

Kumin, you did really a extraordinary breeding and selection, not sure if Poncirus is really much hardier. Only a pity, that frosthardiness and edibility are still in a big distance and will need a lot of further time and work. To my knowledge the only citrus with excellent  fruit when ripe and really frosthardy citrus is Thomasville Citrangequat with hardiness about - 15 C but still one problem is that fruit ripens in spring and will be spoilt in winter freeze under -5 C.

--- End quote ---
Tedburn, good point regarding early fruit maturity. Deciduous foliage is also quite important. I see a goal of breeding for Citrus fruit approaching the quality of conventional cultivars on a tree similar to Poncirus, minus the thorns.
Several of my selections approach, but don't quite equal the hardiness of Poncirus. Only one has fruited and while the juice is acceptable as a drink, the flavors are too intense for fresh eating.

Ilya11:
Tedburn,
I have not measured temperatures in different places of my garden, only one sensor rather close to the house. Minus 8C one night, three days without ground defrost.
None of my unprotected citruses including three oranges grafted on high stem of PT show damage for the moment.

bussone:

--- Quote from: kumin on December 20, 2022, 12:05:07 PM ---
--- Quote from: tedburn on December 20, 2022, 11:25:01 AM ---Kumin, you did really a extraordinary breeding and selection, not sure if Poncirus is really much hardier. Only a pity, that frosthardiness and edibility are still in a big distance and will need a lot of further time and work. To my knowledge the only citrus with excellent  fruit when ripe and really frosthardy citrus is Thomasville Citrangequat with hardiness about - 15 C but still one problem is that fruit ripens in spring and will be spoilt in winter freeze under -5 C.

--- End quote ---
Tedburn, good point regarding early fruit maturity. Deciduous foliage is also quite important. I see a goal of breeding for Citrus fruit approaching the quality of conventional cultivars on a tree similar to Poncirus, minus the thorns.
Several of my selections approach, but don't quite equal the hardiness of Poncirus. Only one has fruited and while the juice is acceptable as a drink, the flavors are too intense for fresh eating.

--- End quote ---

Interesting to observe that zanthoxylum, one of the few Rue genera that is hardier than poncirus, is also deciduous.

tedburn:
Today made a check at my 5 graft Flying dragon. After a low of 8,6 F and passive protection also the new grafts of summer 2022, Clemyuz 2-2 ( ten degree tangerine),Bloomsweet and Poncirus #7 look very good with small green buds. Morton and 5* Citrumelo grafts of 2021 also look nice and healthy.
Also Ichanggqat, plant on the left side,
in ground since  spring 2022 looks good.


tedburn:
A few days ago I liberated all my passive protected citrus from frost protection fleece.
All have been in propper shape, no damage.
Yesterday at a short inspection I noticed light stem cracks at my Dunstan.
When regarding my Wlan thermometer and I saw how fast temperature rises from -4C to 6 C now I can still more understand how necessary sun protection in weather conditions with night frost and full daytime sun is.

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