Answer: Mint can be terribly invasive. It reproduces from seeds and from underground roots. In fact, if you dig mint out of the ground and leave just the tiniest piece of root, it will regrow. The sad truth is, mint is resistant to most herbicides. Some gardeners report success with Round-Up, but it is a non-selective vegetation killer and will affect everything it touches so in a well established garden you may not want to use it. If you dig and pull the mint out each time it rears its ugly head, you'll eventually starve the roots out (they have just so much stored energy). Repeatedly hoeing (and removing) the mint as it sprouts is about the only way to completely eradicate it. Wish I had better news for you!
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