When I looked at my plants earlier this summer I thought I saw the brown ring that indicates a shortage of boron and some plants showed a deficiency of iron. I think I may be guilty of too much nitrogen in the soil mix to start with and the mix is too rich early in the season. As well, I wonder if the ph might be off but hard to say with containers.
I think this concise note applies to me.
https://ag.umass.edu/vegetable/fact-...otchy-ripening