Fertilizers in potting soil #745867 - Ask Extension

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Fertilizers in potting soil #745867

Asked April 23, 2021, 12:26 PM EDT

Does the fertilizer in potting soil such as MiracleGro stay stable over time or does it dissipate? If I use a bag of Miracle Gro potting soil that is a year or two old, is the fertilizer in it still equally effective?

Ramsey County Minnesota

Expert Response

Thank you for writing.

Fertilizer pellets last about 9 months after potting but in a bag, without water, the nutrients have no way to leave the soil.  I would only fertilize if the potted plants did not grow properly.
Many people add too much nitrogen which can cause plants to shift from flowers and fruits to simply have a lot of leaves.

If it is really  important, you could put the potting soil in your garden or windowboxes.

I hope this helps.

Steve Miles Replied April 23, 2021, 12:57 PM EDT

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