Does this plush memory foam mattress need a box spring?

No, and a box spring would actually undermine it. A deep 13" plush bed demands an unbroken, rigid surface so the soft foam cannot bow; a box spring's flex does the opposite. Set it on a platform bed, a bunkie board, a solid foundation, or a slatted base with gaps under 3 inches. That continuous support under the 7" Serta core is what preserves the deep cradle and the 10-year warranty.

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