Nice $5 experiment, you never know what kind of fruit it will bear, if pummelos are monoembryonic, are grapefruits polyembryonic? Laaz you have those ruby's from seed you must believe that it will come up true to parent? Those palms in the background look like Washingtonia, fast growers for sure.

Yes, grapefruits are polyembryonic. Not a lot is monoembryonic, put pumellos are, and so are a few other cultivars, like the Kiyomi tangor (which is what was used to create the Dekopon/Shiranui mandarin, as well as other nice mandarins), Temple tangor, Imp. Meyer to some degree, kumquats, citrons, citron hybrids, Bearss Lime, Bergamot. There may be more, but those are the ones I can remember

Yep, grapefruit are true from seed.

I'm sure you all know the various reasons why all commercial citrus are grafted instead of using seed as the source. Do you have any problems with your seed grown trees, disease, reduced vigor, reduced cold tolerance etc.?

None at all. The grapefruit are about 25 ft tall & still loaded with 100's of fruit.

A labor of love, eh Ivica?

in south louisiana the ruby red is best in may. so sweet and with no after taste.