In dry grasslands it rains for a bit, the seeds sprout, dormant plants recover, everything goes to seed as quickly as possible and then looks dead again.
That’s not what people want when they sow grass. It’s supposed to be green, a nicely dense carpet, soft under foot, and smooth. Not the big clumps of savanna grasses except maybe as decorative accents.
Not many species do that and they’re not necessarily native or even just compatible with the local climate/soil. The weed grasses in your area probably grow perfectly well on their own, but a *lawn* is a way more difficult to maintain monoculture.
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