Is Mojito mint a species, or a cultivar/selection? If the latter, then seed will not get you the same plant. Most mints are propagated from cuttings because it's so easy, and because that way you get the variety you want.
Oh, and I cut back my mints before they go to seed, because if you have several varieties and they cross, you may eventually lose the cultivar/selection. (And also because I don't need even more mints coming up from seed!)
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