Seeds can be eaten by various critters and deposited with instant fertilizer, or blown by wind, can remain dormant and kept damp by nature long enough to root. It won’t come in as full and lush as a manmade watered and cultivated lawn start (which really do need lot of careful care), but in the wild some seeds will manage to root and make it and with enough time will fill out by spreading out from that start. Most grass spread comes from healthy root systems expanding their territory and filling in space over long periods of time, all those healthy grassland ecosystems that are not man made just took time and patience.
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