Someone in my neighborhood in West Seattle has one planted as a street tree and it holds about a dozen fruit every fall, but I’m pretty sure they don’t ripen since they never pick them. I don’t know if there’s any easy way to know if they are ripe without picking and opening them? I keep meaning to knock on their door and ask about it, but somehow I’m always in a hurry when I’m going that way and never feel ready for the semi-awkward door knocking. I posted a photo of their fruit here a couple years ago: