Yuzu?

Never heard of that one? Any details to share about it?

That looks like a trifoliate orange https://www.phillyorchards.org/2019/11/01/plant-spotlight-trifoliate-orange/

Definitely a poncirus. Do you say you smelled it only? No taste?

Poncirus trifoliata. Seedlings are often used as rootstock for edible citrus varieties.

That was my first thought as well. But the comment about the fruit being "very sweet" threw me :-) Poncirus are known for having an extremely acerbic taste - much too sour and bitter to eat out of hand! Common name is bitter orange.

A sweet smell to me; just a bit of citrus taste and not identifiable with other particular citrus fruit. I really didn't detect bitter as much as just tart and little taste. I also have a smaller version in a pot but it has no fruit. Neighbor nearby has a very prolific pair of them that are shorter and more bushy. They stand either side of their gate and have cast most of their fruit. Mine is out in the woods where it was planted as a seedling. Is there anything I can do with them? Think they might slice and dry for potpourri. Can oils be extracted and how? I suppose they're not poisonous or such. I want to experiment with making a variation of Earl Gray tea using them if they won't kill anyone!

Uses?

You might be able to use the thorns as toothpicks!

Looks like yuzu to me

Would love it to be yuzu, but it doesn't seem to fit the profile of having thick, dimpled skin. In fact, the skin on these is very thin and smooth. It seems to acquire a splotchy, dusty brown discoloration on part of the skin as it ages, but some fall to the ground without such blemishes.

@ mandaboott - yes it definitely is trifoliate orange, and it will be marmalade! So excited that it can be useful! the pix on your link are exactly it. Thanks!

Certainly not YUZU. Look at the trifoliate leaves!

We have one of these (trifoliate orange) growing in our yard (NC), that was here when we moved in (15 years ago). This year it has produced more fruit than previous years and they have ripened to orange, whereas in previous years the fruit would reach an acidic pale yellow and then fall off. Your post has got me thinking of ways I might be able to use it - love the tea idea!

Trifoliate thorns are ideal non-metallic picks for cleaning lint out of cell phone charge ports!

There are 2 trifoliate selections with less objectionable taste. Swamp Lemon discovered in North Carolina and Poncirus+ found in Ukraine, Eastern Europe.

@decoenthusiaste said "yes it definitely is trifoliate orange, and it will be marmalade!" or simply orange juice ;) here: https://www.phillyorchards.org/2019/11/01/plant-spotlight-trifoliate-orange/

Missed the entire opportunity this year, but next I'll harvest both mine and the neighbor's so I should have something to report then. Thanks all of you for the input. If you do something with them, please post here to follow up and encourage others to get busy!

@decoenthusiaste, Good luck with those seed packed fruits. I believe, in England, it is used to make marmalade.

Quite a few members on this forum would probably like to get their hands on some PT seeds for their grafting experiments.

To the opening poster, I wonder if it could be something called "Swamp Lemon".

Where do you live?

Yes, obviously it is a form of Poncirus trifoliata, but there are a few varieties of Poncirus trifoliata that do not taste as bad as the usual type. Swamp lemons can sometimes be found growing wild in parts of the US Southeast, as far north as North Carolina. Apparently some people even used them as a lemon substitute on fish (although they probably don't taste anywhere near as good as a regular lemon).

It's definitely not Yuzu. If you look at the shape of the leaves, they are trifoliate.

I've tasted a fruit from a selection of Poncirus trifoliata that was not bad tasting (or maybe one should say "less bad tasting"). I don't think it was " Poncirus+ ". I was told the plant came from an ordinary Flying Dragon (variety) that the owner originally got at OneGreenWorld.

I've tasted hybrids of Poncirus (like one citrange) that were completely inedible and made me want to immediately spit it out, whereas this pure variety of Poncirus that I tried was tolerably edible. The taste was insipid, flavor a little like pine, a slight turpentine taste (though not really in a bad way), and just a hint like eating a perfumed soap, but it seemed to have virtually none of the horrible flavor that a Poncirus fruit normally has.