Answer: Mint tends to colonize an area rapidly by runners (and possibly also by seed) unless it is contained, so in that sense yes, it will cover the area. It will also withstand occasional mowing. I would caution you to be sure you want such an aggressive plant as a groundcover. The standard mints such as peppermint and spearmint would all be fine, some of the specialty mints aimed at collectors seem to be a bit less hardy; be sure the stock you start with is free of rust. Mint can be started from seed and for this purpose that should be adequate. In some cases mints will "cross" so if you require a specific mint I would suggest you start from a plant or plants which you have taste-tested to be sure it is a "good" strain.
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