Dirt Doctor wrote:
Spearmint is a wonderful herb but as you know quite invasive. The good news is that the rhizomes (underground runners) are usually very shallow and easy to pull out of the ground. Do a little more hand work and enjoy some tasty herb teas and mint juleps.
i concur...i had a huge patch (about 200 s.f.) that I ended up spading up and out, now it's a tidy little 5' sqaure patch. i have to get the runners that quickly grow out from the edges about three times a year, but if you keep at it you can maintain a more tidy area. just pull up on the runners and you can keep them from spreading and they easily pull up out of the ground with out too much trouble.
give the runners you pull out to neighbors as a gift!