Fertilizing tall fescue lawns in Maryland is best done in the fall (September/October) and must comply with the guidelines of the Maryland Lawn Fertilizer Law. In the spring, if your lawn is thin, you can fertilize it with a slow-release fertilizer. This will release nutrients slowly over the course of 8-10 weeks. - Presented by Geoffrey Rinehart, University of Maryland Extension.
More information about fertilizing home lawns in Maryland: https://extension.umd.edu/resource/fertilizing-home-lawns
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