I just went to the Hoyt Arboretum, in Portland, and saw the Ichang papeda tree there. It's up growing against the wall of the visitor center.
They also had a Wollemi pine plant that I noticed. Getting off-topic for a moment, the Wollemi pine looked like some of the top had died back, perhaps due to the previous winter, but overall it looked like it was surviving and doing okay. It didn't look like it was ever covered, and it was at least 15 feet away from the building.
Back to the Ichang papeda, the tree is about 6 feet tall, and there was a fair amount of fruit on it. Maybe 40 percent of the fruit looked like it had dropped. Half of the fruit looked like a ripe yellow, or very close to being ripe, but the fruit size was pretty small. Maybe not much bigger than poncirus. So maybe in this climate the fruit does not have time to grow to its maximum size, or maybe it is still too early in the year (October 6).
The tree itself looks like it is doing well. I could not see any signs of the base of the tree being grafted on to anything, although I cannot be entirely sure. So it might be own-root. The leaves looked a healthy color.
The fruits smell similar to lemon, but deeper smelling, maybe almost a little bit resinous woody smelling (entirely in a good way). It's a beautiful fragrance, at least in my personal opinion.
Something about the fragrance smells just a little "off", in a way that sort of reminds me of kaffir lime. Maybe even almost the slightest bit "skunky" (but I would not say in a bad way).
The fragrance is very similar, in a way, to Yuzu, except without the sour orange type of fragrance and without the "spiciness".
I am thinking the visitor center is probably unheated during the winter, when the visitor center building is closed. But the wall would still provide a wind break.
The location of the Arboretum is within the city, but on a mostly forested little mountain ridge inside it, and it is at the top of the mountain but there are numerous trees everywhere, and lots of bushes closer by, so it is not "out in the open". Probably being higher up, it is not as subject to the colder air that can flow down through the valley sometimes in the winter.