Has anyone ever used out of date nutrients I have some Canna Coco A & B that's out of date just curious if will still be ok to use.
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A+B nutrients made for coconut coir is primarily made of mineral salts and chelates with a higher ratio of calcium/magnesium to off-set coconut coir's tendency to .
Some minerals are chelated to prevent oxidation/insolubility but eventually, your nutrient/ion ratios will distort as chelates begin to slowly degrade.
Iron oxidizes easily and is commonly used in chelated form (i.e. EDTA or EDDHA) so I would guess that's the main culprit in expired Canna Coco A + B.
In other words,
If you want to use Canna Coco A +B that's "expired", keep an eye out for nutrient deficiencies, primarily iron.