I am searching for a Poncirus with less seeds. I have seen that there are varieties in Japan that have only about 12 seeds at average (I suppose under good pollination conditions). Does somebody have such plants?

It is theoretically possible to produce a seedless poncirus.

The Japanese identify four groups of Poncirus that are suitable as rootstocks and the tetraploid form which is not.

Tetraploids occur between 5-10percent of seedlings.

Hybrids between diploids and tetraploids produce triploids.

Triploids will only produce seed if crossed to another triploid and then often in very low numbers. Growing them with diploid usually means no seed.

Yes, but I would like to have something diploid so a plant with healthy sex life The Japanese have a low seeded Poncirus with mostly monoembryonic seeds. That would be the ideal. But diploid and low seeded is also interesting for me.

You can rule out the cultivars argentina, australian, barnes, benoit, benecke, big leaf, christiansen, flying dragon, kryder 55-1, rich 16-6, rubidoux. All very seedy.

Other cultivars at UCR are english dwarf, english large, fairhope, florida, frost tetraploid, jacobson, kryder 15-3. 16-6, 38-3,5-5, 55-5, 60-2, and 8-5, medium, little leaf, marks, #22, #26 nanjing, #27, pomeroy, rich 12-2, 22-2, 7-5, ronse, simmons, small leaf, swingle, troyer, texas, towne f and g, usda, webber-fawcett#22 and yamaguchi.

I think sylvian has korean trifoliate.

You will probably struggle to get a named cultivar. Barnes and rich 16-6 occassionally come up, rubidoux is common - all three are seedy. Fast flowering trifoliate may be slightly less so but still don't think meets your critera. Have you considered a variegated form.

Cannot see anything on web that indicates poncirus is anything other than seedy.

yuzuquat,
are there evaluation datas on UCR for every cultivar?
I couldn`t find any data for poncirus.
Thanks

The ones I listed as unsuitable have a link usually including cut fruit.

The others don't.

The truth is that if a cultivar has ever been trialed as rootstock one of the criteria will be large quanties of nucellar seed. This is a particular reason rubidoux is used above the normal 98percent nucellar and numerous seed.

Korean trifoliate is presumably from wild collected seed and therefore may have forms with low seed counts/higher juice levels. Someone on forum has written about wild stands or naturalising pt in USA. Again possible sources.

Wow! That are a lot of names, yuzuquat!
But as you said I fear that the reason why a Poncirus got a name and is distributed is exactly because it is the least usefull for my purpose. So the best would be good scientific datasheets or sundry plants from forum members that happen to have low seed content.

Have you checked out citranges web page at home citrus growers.

You might find the poncirus at Leatherhead crematorium interesting.

due to only 3 seeds out of 50 fruits could this be a triploid poncirus?
nearly no seeds seems very strange. are there other possible explainations?

Poncirus seems to be on border for regular fruiting in uk.

Mike (citrange) identifies poncirus that fruit as far north as Edinburgh but has yet to find plants that flower here in north west.

I've had plants in pots for years. Possibly not warm enough in summer.

At leatherhead in some years maybe lack of pollenators due to our cold wet springs.