Answer: Your magnolia is definitely showing signs of stress. The premature browning of flowers can be a result of winter injury or a fungal disease (especially if it rained while the blossoms were fully open). Yellowing leaves can indicate over- or under-watering and brown edges can indicate salt build-up (over-fertilization). I suspect your magnolia would prefer to be planted directly in the ground where the roots would be protected from winter cold and summer heat and where the moisture level is a little more consistent. Plant it in-ground if possible. If not, replant it in a larger, more substantial container using fresh potting soil. A wooden container which will be thick enough to insulate the roots a bit more than the pressed paper pot that you're currently using.
Best wishes with your magnolia!
Q&A Library Searching Tips