sooby said:It looks like a micronutrient deficiency but that could just be because of cold. Do you know your soil pH?
sooby said:It doesn't look typical of leaf streak, although leaf streak can follow cold (or other) damage. This picture is of a micronutrient deficiency caused by the pH being too high for a particular cultivar, although sometimes this sort of symptom clears up as the soil gets warmer:
I'll do the pH test tomorrow, and see what's what. I'm just a bit surprised that I'm only seeing this in one clump of Chicago Apache -- out of 6 in the ground and 2 in pots.
Thanks for the great info! Just curious...is a manganese deficiency something I can correct? Or does it just disappear once the pH is corrected?