re: I'm filling in holes with topsoil

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What is the best time of year to level with mason sand? Should i let my st aug really get going or do it while its still greening up?

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When the grass is actively growing, so now or later, but the LSU AgCenter recommendation is to add no more than 2 inches of fill at a time, let the grass grow through that, and then add more fill as needed, never exceeding 2 inches per application. Otherwise, you may smother the grass with a deeper application requiring re-sodding.