The Tropical Fruit Forum

Oh that's cool, I'd have just expected one parent, the other, or a mix. I think Ilya uses taste as a predictor of flavor, right? This bodes well, hopefully you'll get fruit off that one reasonably soon.

Seems to be living up to is name then. That's cool

to buy a Kumquat Tree in Florida... to bring back to Ohio

Please, please, please do not do this.

I don't know if you've played Elden Ring, but Florida is citrus Caelid.

If your plant has HLB, or one of the numerous other disease and pests afflicting citrus in Florida, there is a very real possibility of it spreading, even in Ohio (there are plenty of native relatives of citrus, not to mention other people growing citrus, and plenty of insects who could prove to be chance vectors). There are a lot of ways of getting really nice kumquats without breaking state and federal law and endangering people's livelihoods and, even worse, hobbies. I second the suggestion of Madison Citrus Nursery--they're amazing, have reasonable prices, and great plants.

Yeah, cold hardy citrus breeding is no walk in the park.

Again, one of the biggest roadblocks is high rates of nucellar seed. What probably needs to happen at some point is someone needs to make a dedicated effort to breed zygotic seed into cold hardy citrus.

To do that, you'd want to take a bunch of fully zygotic varieties like Meyer lemon, ichang papeda, one of the more cold hardy pomelos, rough Seville orange or some other zygotic sour orange, then some combination of (1) breed then with each other, using ichang papeda as your main source of cold hardiness and then screen your F2 generation for hardiness (2) cross them with the handful of zygotic poncirus hybrids (eg the SuperSour series of rootstocks) and again screen for cold hardiness in the F2 generation, (3) find out which fairly cold hardy hybrids have one fully zygotic patent, ichang lemon for example, and cross it with your zygotic varieties, then screen the F1 generation for zygotic seed, and (4) cross them or some of your good F1s and F2s with the nucellar but very hardy hybrids and varieties like 5*, Dunstan, Changsha, then backcross those F1s with your fully zygotic plants again so that hopefully you'll have some fully zygotic F2s.

Lots of options, but none of them would get you results in a single generation. You'd probably need another two generations to then select for the best cold hardiness. That's at least a lifetime of breeding work. However, were someone to do this, it would make cold hardy citrus breeding much, much easier. And if you went for an four options, and were sure to include a wide variety of sources of zygotic seed (lemon, pomelos, sour orange) you'd end up with a lot of genetic diversity to work with to get the fruit quality you'd need for something not just edible, but good.

8B is probably one of the better zones for attempting a project like this.

No reviews yet. Wouldn't hurt to message the seller and ask them about it. Heck, the might even be a member of this forum and would be interested in making their case for the new variety.

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.

Not sure since when, but Madison now has a "Erem x Shek" cross available. Anyone have any idea what that tree is like? I'm guessing this is a new cross.

https://madisoncitrusnursery.com/products/erem-x-shek-citrus-tree-for-sale

Thank Ilya, if I can pull together enough data from the literature for the varieties I've got in the table I'll definitely include columns for this.

Those with low % zygotic are not dead ends if they make normal pollen.  But this list will help people choose seed parents,

Yeah, dead end is a bit too harsh. But it is a pretty significant issue imho. Given how dominant the trait is, even using highly nucellar varieties as pollen parents will mean that the resulting hybrids will likely also have nucellar seedlings. I considered putting in a column about whether the highly nucellar varieties may be heterozygous or homozygous with regards to that trait, but I've not seen enough papers actually saying nucellar seedlings is just a classic mendelian trait so I'm not confident in putting that kind of information out there, let alone good sources on which highly nucellar varieties are hetero/homozygous. Heck, just cold-hardiness and %zygotic is already pretty messy...

I'm not the original poster but I'm also on the lookout for ichang papeda.

Would these be your first fruits from US-1279 kumin?

Interesting table, though we all know, that the datas can only show a rough estimate due to complex influences of coldhardiness, as rootstock, ..... From my experience some very cold hardy citrus as Citrumelo x Yuzu, Chimera Prag, Bloomsweet Pomelo, 5* Citrumelo and Morton Citrange are still missing.
Morton ( on Poncirus) and Chimera Prag ( survived in my region -16 °C with fleece protection (Morton on FA 5 with 30% twig damage). The others -13 ° C also as a 1 year old graft of Clem yuz 2-2 on Poncirus.

Added

Updated. Thanks!