I agree. I also have something looking very similar. Notice how the leaves
are deteriorating around the edges and from the tip back.
Agree, probably K but maybe also much more.
Suggest you get a professional soil test and then make the indicated
amendments.
Here in Pennsylvania, for example, it is Penn State. They provide a pre-paid
kit for $9 and postage is around $5 or $6. That's not cheap, especially if you
do very many but for one garden maybe once or twice a year it's not that
bad and the results are usually worth it.
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