I kept alive a scrawny apple tree in a large pot on my apartment balcony for 20 years, because it grew from a Gala apple seed planted by my daughter in preschool. (Obviously it didn't make Gala apples, but it made some pretty flowers and tiny crabapples that were sweeter than you'd expect.)

I learned that apple trees are prone to fungus and really like good drainage. If I were doing it again I'd use something lighter than potting soil, like Orchid or even Desert Mix. Not sure how that translates to in-the-ground gardening but I do think you're right about it being waterlogged. I'm sure you could dig in something around it to let more dry air into the soil and let excess water drain.

I have a blueberry bush too, and it's much hardier.

[–] Drusas@kbin.run 4 points 5 months ago

Thank you, that is helpful. I can try to amend the soil or perhaps even relocate the tree.