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Could be a really dumb question but my plants experience a magnesium deficiency but not a calcium deficiency. Is it possible to fix it with calmag or should I buy a mono fertilizer with only mag? I have calmag here, magnesium mono I'd have to buy.
Just use the calmag, it's doubtful it's gonna get too much calcium. They both work together in different processes sorta like how sodium and potassium does in humans.