I remember reading a few years back that if your goumi dont get adequate sunshine they will not form fruit buds in the fall… and no fruit the next spring.
I think the minimum was stated as 6 hours direct sun.
All of mine are in all day sun locations and they load up on fruit each year.
TNHunter
You can find this with Goog search…
Goumi bushes thrive in full sun for at least 6 hours daily, which is crucial for fruiting. While they can tolerate partial shade, they produce more berries and flowers in full sun. Sufficient sun exposure triggers the formation of new flower buds for the next growing season, ensuring a good harvest.
I have a very large pergola that is now two separate 8-10’ sections that used to be connected with an arch in the middle. It rotted and fell down, so now, it’s really two separate sections with a 3-4’ between. I have a little bistro set under the kiwi section on the east side section and the west side has the passion fruit on the south and the schisandra on the north side. The kiwi is planted on the far SE (female) and SW (male) corner. I’m keeping an eye on it, but it will mean dragging out a ladder to cut it back.
My quince is in it’s third year, it was just a year old rootstock that I grafted a scion onto in spring 2023, so it’s still a pretty small tree. That said, it’s grown as vigorously as I would expect it to in full sun conditions thus far. No flowers on it this season, so I suppose I can really only vouch for it’s ability to thrive from a growth perspective - not sure about the fruiting yet (but so far good vigor, no disease/pest issues, etc). It’s up against a fence to it’s east, ~15 feet north of a large leyland cypress that shades it for most of the day. So it gets some morning sun, and then again around 4pm until sunset. My original goal was to hack off branches of the (protected by my municipality) leyland over time to give it more sun, and that it would reach out into more sun as it’s canopy develops (my neighbour also has a large tree blocking late morning sun that is dying and should be removed this year)… But I’m tired of fighting my municipality over these ridiculous protected trees, so I’m just planning to move now 
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Since people also just mentioned goumi I’ll comment on that as well. My goumi is just to the south of the quince in even more shade. It was in a full sun spot for 2 years, and then I moved it into this shady spot last spring, so this will be the first year that it will be settled in enough to see how it does for fruit. It is loaded with flowers, so that’s a good sign.
I’ll post pics of both plants (typing on computer now, will do a new post from my phone with the pics)!
Since when are leyland cypress protected? Those things are everywhere. I’m in the process of taking down two huge leylands I planted.
In my municipality (Saanich, BC) any tree over 60cm diameter is protected. Our property is plagued with them on each corner of the property, and the municipality won’t even let me cut the one down that sends roots into my perimeter drain and flooded our basement… they’re terrible trees, and a real challenge to grow fruit trees near when they rob all of the water and nitrogen from the soil.
