The Tropical Fruit Forum

UH Mānoa's agriculture department reported in July of 2017 (https://hawaiiavocado.weebly.com/uploads/2/6/7/7/26772370/f_n-49.pdf) that it was becoming increasingly popular both as a fruit and rootstock around Maui. If you reach out to them, they may be able to point you in the right direction. Failing that, I'd reach out to the organizers of the Okinawan Festival on Oʻahu, as I gather fruit has been available at the festival in the past. Good luck, and report back! I'm sure some other forum members in the islands would love to know. (I'm not sure the origin of any Hawaiian accessions of Shekwasha, but it would be interesting to do some research there, as to whether they were older Okinawan imports, more recent (and perhaps illicit) Okinawan imports, or brought in from one of the introductions to the mainland as part of rootstock trials.)

Conventional wisdom is that bergamot is largely monoembryonic, i.e. that offspring should be zygotic/sexual. I'm growing some from seed, but mine are about as far along as yours

Probably not helpful to you, anyway, since they can't ship to Texas

Spend some time on Google Scholar. There's no minimum age, but it depends on skill, level of care provided, etc. The site is broken right now, but the UC Citrus Production Manual is a great resource to get oriented in general.
https://anrcatalog.ucanr.edu/Details.aspx?itemNo=3539 Spend some time with the archives of this forum (and others) and on Google Scholar, too.

What is K x R?

Koethen sweet orange x Rubidoux trifoliate orange

Given that you're in Florida, it may be more likely that they're simply in the environment rather than associated with a commercially-propagated tree. Whatever you end up doing, definitely try to select something you're willing and able to keep up. Your local agricultural extension might have the best insight about what to do in your area, based on their knowledge of local ACP/HLB conditions.

I find TreeSource much more patient, responsive, and reliable than Lyn, but I haven't bought seed from them yet. They do offer C-35 and C-32. I don't know whether TreeSource can ship to Arizona, but I'd expect so. If you give them a call, Lloyd should be able to answer any questions.

AusCitrus is definitely a good one, and definitely do international orders. There's folks in South Africa, including CRI, who seem like they ought to work, but I've had a difficult time communicating with them (I have tried.)

It seems like Citrus New Zealand was supposed to have a trusted budwood distribution program, but I've also struggled to find information about it. Have you contacted them to ask about domestic seed suppliers? (And if you do, or if you already know, I'd be very keen to know what kind of seed they have available, and whether they ship internationally! I've read some historical accounts that include information about when different rootstocks came into use in New Zealand, but don't know anything about the contemporary landscape. I assume it's probably pretty basic, unlike Australia which has had an infusion of Chinese funding and germplasm to support closer ties with China around the citrus industry — all of which is export-restricted.)

TreeSource carry DaisySL (the code is "DSL" in their system), but I haven't seen it in any of the recent liner availability lists I've had from them. They do sell budwood, but I don't know if a license is required for DaisySL as with some other relative new releases.

And yes, DaisySL is an irradiated bud sport of Daisy, so you want VI 763, which is in CCPP's variety list, but not listed among the available varieties. Again, there may be a licensing issue here, I'm not sure.

Oh nice find!

Maybe the nursery had some stock in their collection and decided to propagate it on the chance people would be interested in it for the HLB resistance genes it might carry.

Whatever the reason, nice to see C. glauca crosses in the trade. Not sure who could grow this, since I assume the Shekwasa parent isn't cold hardy at all, being from Okinawa.

Back when Shekwasha was being trialed as a rootstock in north Florida, it was considered rather cold hardy, and Agrumi Lenzi and others describe it as being very cold hardy today. Some of the sour mandarins are extremely cold hardy. Some sources report shekwasha being about as cold hardy as changsha mandarin or a citrumelo. I'd guess it depends on the weather before the freeze, i.e. whether the tree is semi-dormant or not.

I'm growing a large number of shekwasha seedlings from multiple sources because it seems like it's worth finding out rather than trying to guess. (I'm very fond of sour mandarins anyway, and particularly shekwasha, so having lots around is a win for me even if it doesn't turn out to generate any particularly hardy seedlings.)

I'm sure growing conditions matter, too, and tachibana is also fairly genetically diverse, such that fruit quality varies a lot. Of course, with them mostly not being grown for fruit eating, that doesn't much matter. I'm curious about your comment about shekwasha: do you dislike them ripe? I like them when very, very ripe; I understand that culturally and commercially they're most useful in Japan when green, but a properly tree-ripened fruit is really quite lovely.

In my area, I'd wonder about birds that nest in Crataegus finding themselves at home in Poncirus, and in some parts of the US, I'd wonder about the native Zanthoxylum species. Thorny and dense growth is definitely a pretty great nesting niche if you're adapted for it!