Unless the plant is very small, I wouldn’t think that Yuzu needed protection in zone 9A?
Yuzu is said to be an 8A plant, so should be fine after year 2 or so i think?
If Virginia Fruit grower reported it you can put a lot of faith in his data.
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I not questioning his report at all. But I would like to see more than just a single statistical sample of this OP variety. It could be that his plant is genetically unique and very rare since I can’t seem to find any other references to this variety on the internet.
He is very responsive to inquiries on Facebook. Very helpful. He’s a mensch.
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Yes, he was very responsive to my question about the variety…
His response to my inquiry about the variety was “…I got my OP Nagami from a local citrus mentor that got me into citrus many years ago. He got his start from a long defunct company called Oregon Exotics which sourced theirs from Dr Brown. At one point there was a nursery in Texas that propagated it but that was long ago too. Now nobody has them. I need to propagate it to make it available. Thanks for checking out this vid!”
My inquiry to other people for their experiences with this OP kumquat variety is in no way meant to disrespect him or meant to question the validity of his assertion regarding the variety’s cold hardiness. I surmise the lack of responses from this forum means there aren’t many people who has experience with this OP kumquat.
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As far as I know, nobody thinks you have disparaged anyone. I merely reaffirmed that he is a reputable source.
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i protect them from deep freezes because i don’t want leaf damage and/or defoliation. besides they are young. and the rootstock makes a difference. i have an unknown lemon (8 years old) and lime (7 years old), both on their own rootstock and though they defoliated this winter and last winter, they bounce back because they are older.
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As a passing thought while thinking about the prague citsuma, how some say it is a chimera and also how chimeras are made, I wonder if it is even remotely feasible to intentionally try making chimeras en mass by bud grafting just a sliver of bud of a the earliest variety of citus right into the middle of a bud of trifoliate then see if something grows and grow it out to fruiting and see if it is a chimera that has the benifits of both parts?
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Maybe. Wounding the already calloused graft union and cutting the scion back to just above the graft union to try to form buds in that area are other ways to try and force it
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And dosing wounded callus with growth hormones 
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I’m trying to synthetically produce a citrus chimera, but the best option I found requires seedlings to do it. I’ve been able to find seeds for the trifolate half, but finding seeds from early, high quality satsuma varieties has been challenging.
There have been multiple successful attempts at synthetically producing a periclinal chimera in citrus. For the best technique, they had been focusing on making a more disease resistant plant (to citrus canker & CTV) by having the high-quality fruit of one variety (Layer 1), but everything else (layers 2 & 3) from another disease tolerant plant. I figure I can repeat this process, but instead use a vigorous, cold hardy trifolate for layers 2 & 3 to select for cold hardiness instead of just disease resistance. I know that one concern is that this new chimera I want to make will have the same, unproductive and slow-growing downsides of Prague Citsuma, but I discovered that there’s a number of citrus perclinial chimeras that are commercially important, so good chimeras must be possible.
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How about using sudachi? They are on the small side, but produce excellent fruit. I’ll have lots of those seeds next fall if you want them.
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Are trifoliate/satsuma chimeras more resistant to HLB?
A neighbor who is moving away just gifted me a Makrut (Kaffir) lime and a Buddha’s Hand that are each several years old, maybe as many as ten years old (although the Makrut lime is tiny to be that old). They are in pots, and I’ll likely keep them there. But I’m wondering how cold sensitive these plants are. Better than a key lime? Worse? I’m having a hard time finding any reliable info online. Many thanks if anyone has experience.
I didn’t see any exact temperature ranges listed, but I wouldn’t expect either to survive below 32F for very long. Buddha’s Hand is just a weird citron which aren’t particularly cold hardy.
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Basically what evilpaul said. Buddha Hand is a citron, even light frost can kill it. Makrut lime is a little better, but still very frost tender, upper twenties is probably all it can handle.
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Finally getting some Prague Chimera fruit to set here in zone 7a north NJ. My original plant is 5 years old, the plant in this video is a graft I did on taitri (Taiwanica x Poncirus) which is about 3 years old now.
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cool find, reminds me of the myrtle leaf bitter orange citrus. if it ever gets any extra branches graft it to something incase you lose it
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I don’t espalier but I have hybrids and a chimera really close to a large retaining wall which helps with a little extra heat. I am in zone 7a north NJ.
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