Do dry fertilizers expire? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 04-16-2019, 07:56 PM Thread Starter
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Do dry fertilizers expire?

My dry fertilizers are several years old. It occurred to me that these might have expired and at least lost potency. Anyone know whether dry ferts expire?


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post #2 of 2 (permalink) Old 04-23-2019, 06:29 AM
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As long as they were stored in a dry, dark environment, there should be no appreciable degradation, at least for the macronutrients.

For the micronutrients, I might be a bit concerned with the stability of the chelation, but it should still be OK.
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