Do the leaves look chlorotic - veins green, leaf yellow? If so, this is an iron deficiency, which goes hand in hand in raising the pH, but doesn't mean they aren't getting enuff acid really. Confusing, huh? Is the new growth turning yellow before the old growth? or vice versa? New growth turning yellow first means an iron deficiency, while older leaves yellowing can mean a nitrogen deficiency.

Other environmental issues can cause leaf yellowing, too. For instance, excessive sunlight or underwatering. If only one side of the plant has yellow foliage, that could be the cause. Try moving the pots if you can, to see if this rectifies the problem before treating them for nutrient deficiencies.

You might also try a ferrous sulfate (iron) foliage spray, used according to directions, and wet the foliage well with it, apply once a week, to see if that helps your blueberries out. I don't think it will hurt them at all, and while most acid fertilizers take time to break down to usable form, the foliar spray will help bridge the gap between now and then.

Hope this helps, and Scott may have advice that precludes mine.

Susan

I don't know what to tell you. I can only suggest 100% peat moss (Canadian sphangum) with 4 inches of fine peat bark on top (or pecan shells). And then keep the peat moss wet, but not saturated, and fertilize about 10 times per year at half strength if in pots and 5 or so if in the ground.

It's very possible that mine that are doing well would not make it with the same methods if I were growing them in your location with your soil.

My single best plant (which produced 9 quarts this year) died last week. It was sudden so I am guessing glyphosate drift, but can't say for sure. That's just the way it goes.

I would also post your question in the container forum. I have learned a ton about growing in containers there and they will for sure get your blueberries on track.