Per Pennington website:
Seeding and Overseeding Thin Lawns
Seed or overseed with Pennington Zenith Zoysia Grass Seed and Mulch in late spring or early summer. Wait until all threat of frost has passed. Zoysia grass germinates best with soil temperatures around 65°F to 70°F. This roughly corresponds to daytime air temperatures near 80°F or more.
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