If it's a full sun exposure, the oriental/native grasses will spread fairly quickly, but typically have to be cutback annually in early Spring or eventually they develop problems. This is what they use in a lot of highway construction applications(crown vetch). I'd consult a landscaper about seeding it, but I believe if you start it in a few areas it will eventually take over the existing grass.
Brought from Europe to North America in the 1950s, crown vetch quickly outlived its welcome. The aggressive plant is fairly attractive, and performs well as ground cover, but use it with care.
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