Seamaiden
Living dead girl
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I would first perform a slurry test on the soil. This happened to me just this year due to using an acidic soil. I was able to bring them out of it, but not all are quite right again. If the soil pH is out of whack, I would re-pot or try feeding/watering with pH adjusted feed/water, adjusted so as to help counteract or counter-balance what's going on in the soil.
Slurry method is stupid simple. You take samples of soil, you want as many samples as possible and from as many depths as possible. Mix those up.
Now you need either distilled or very clean RO or RO/DI water, measure the parameters (EC and pH). Mix enough of the soil with the water to make a slurry. Let that set for 7-10mins, then retest. You should have a better idea of what's going on in the rhizosphere doing that. If you find it's acid (below 6.2 I would consider to be acidic) then treat accordingly.
Slurry method is stupid simple. You take samples of soil, you want as many samples as possible and from as many depths as possible. Mix those up.
Now you need either distilled or very clean RO or RO/DI water, measure the parameters (EC and pH). Mix enough of the soil with the water to make a slurry. Let that set for 7-10mins, then retest. You should have a better idea of what's going on in the rhizosphere doing that. If you find it's acid (below 6.2 I would consider to be acidic) then treat accordingly.