Answer: Unfortunately, mints can be invasive in the garden and very difficult to control once established there. This plant will grow from any trace of root left in the soil, it will also seed about and plant itself if allowed to set seed. So your control measures need to be thorough and will need to be repeated. You can try an herbicide containing glyphosate, be sure to read and follow the label instructions completely. (You may need to use it more than once.) Then if any pop up later you can try digging them out by the roots. Also make sure that you do not allow any of the plants to set seed from now on. I would suggest you begin with planting only annuals at first so that you can continue to control the mint as needed for a year or two without worrying about accidently damaging the more expensive perennials. Good luck wiht your garden!
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