With all the incorrect information out there on random asian persimmon cultivars being “zone 6” hardy etc, we need a good resource of what the facts are on cold hardiness of asians and hybrids etc.
Especially taking into consideration these 10 year polar vortex freezes that kill back nice orchards in zone 7 where hardier plantings could have avoided that, if the correct info were available.
Would you all be up for us getting together and sharing lists of what persimmons were lost or survived, in your experiences or trials, or those of others, and at what low temp and zone this result happened?
Then we can make or edit a good list of estimated max cold hardiness with the goal of better recommendations for longer term zone dependability.
I am compiling a list of the Asian and Hybrid persimmons and what experiences have been with each cultivar and I am curious as to whether any of your types are ones with a reputation to be a bit on the hardy side (-5F to -10F?) like Saijo etc?
I would love us to all get together and compile a great list of minimum temps each has survived or failed and get a factual list of what is worthwile for further trials in zones 6a(took -20 to -25F), 6b(took -12 to -18F), 7a(took -6F to -12F), 7b(took 0 to -6F).
There is a lot of mis-information out there such as on reputable sites like ediblelandscaping of Asians being hardy to “zone 6” etc and it would be great if we could create a detailed resource that took into account these 10 year lows.
There are quite a few asians that seem hardy to zone 6b down to about -15F like Steiermark and Inchon, and Chinebuli, from the reports I have read so far.
So here is my rough draft list of types and Low temps that they seemed to have survived based on info and reports I have read, if you see any that need updates or corrections or added data let me know. And I understand this is tricky since a mature tree might take a temp undamaged yet a young graft next to it might die…, yeah so many variables such as wood thickness, windchill, windbreaks, micro-climates, humidity, snow cover, etc, and also some named cultivars may have more than one strain or type being shared under the same name…
So yeah, younger grafts probably need protection for a few years before reaching this level of hardiness temos, but yeah.
So here is a rough draft of what I have been able to gather on estimated maximum cold hardiness for perhaps a semi-mature tree for longer term zone semi-dependability and some are only estimates based several differing experiences or on people making general statements of one being a bit hardier than another so this is general estimates so far with need for further testing and confirmation:
*(This list is for 15 year polar blast safety, and longer term viability of an orchard, not average USDA zone low ratings).
*(Also, said zones near US coastlines, and east of the Appalacians, are less apt to get such extremes, than inland, mountain, and midwest areas)
So here is my list for hopefully longer term success, coldest survival temp range with limb/top damage likely:
(More edits comming as we compare results)
*Zone 5b:(USDA zone low is -10F to -15F but 15 year midwest/mountain polar vortex can be -20F to -33F±.)
Jt-02. -20 to -25F?
JBT-06. -20 to -25F?
Americans are more sure in z5, some of the best are:
Geneva Long. -32F.
Early Golden, 100-46, H63A, H118…
*Zone 6a:(USDA zone low is -5F to -10 but 15 year midwest/mountain polar vortex can be -15F to -24F±.)
Chuchupaka. -16 to -20?
NGxThor. -16 to -20?
Rosseyanka. -18 to -22?
David’s Kandy. -16 to -20?
Kasandra. -17 to -20.
Nb-02. -16 to -22F.
*Zone 6b:(USDA zone low is 0F to -5F but 15 year midwest/mountain polar vortex can be -10F to -18F±.)
Sosnovskaya. -12 to -18?
Cherniaeva. -12 to -18?
Pamjat Pasenkova. -11 to -16F?
Sovietski. -12 to -15?
RosseyxSaijo. -11 to -16?.
Inchon. -11 to -16.
Steiermark. -11 to -15.
Korea Kaki. -10 to -15
Patapsco. -10 to -14?
Chinebuli. -11 to -15.
*Zone 7a:(USDA zone low is 5F to 0F but 15 year midwest/mountain polar vortex can be -5F to -13F±.)
Gora series. -6 to -12±?
Kyungsan Ban Si. -5 to-11?
Yamagaki. -8 to -11?
Miss Kim. -8 to -11?
Nikita Gift. -9 to -11?
Shan Xi. -8 to -11
Orest, -8 to -11
Chibacha -9 to -11.
Bass PA Tipo, -9 to -11?
Picudo. -8 to -10.
Russian Kaki. -8 to -10
Great Wall. -8 to -10?
Tecumseh. -8 to -10?
NB-21 Hybrid -6 to -8?
Hokkaido. -5 to -9
Saijo. -5 to -10.
Smiths Best. -5 to -7.
Sheng. -4 to -6.
Most other kaki 0 to -5 zone7b, or zone 8 in extreme midwestern/mountain polar vortex blasts.
To be safe, especially in the midwest, I recommend going with things hardy a half zone above you, if in 6b plant those I listed in 6a, if in 7a plant those listed in 6b, etc…