Northcountry Blueberry Help
I have a potted Northcountry blueberry bush that has taken a turn for the worse in the last month, and I'm hoping someone can help me out with figuring out why.
The leaves on a single branch of the plant started to turn red (starting at the edges and moving inwards), and then drying up and going brown. It seemed to be just the one branch, but a few weeks later it turned into a plant-wide phenomenon. The first incident happened a couple days after I fertilized, but I fertilized very lightly so I would be surprised if I burned it.
I water with diluted vinegar periodically to try to keep the pH down. I also have a second blueberry bush (a Duke, Bluecrop, Elliot 3-in-1) that is thriving with the same treatment.
Healthy plant in mid-June:
Struggling plant today: