You can use organic methods such as laying down newspaper followed by mulch in order to suffocate the mint or you could dig it all out making sure to dig out the root system as well.
If you are comfortable using weed killers I would recommend using Kiwicare Weedweapon. It is a systemic weedkiller so it will kill the weeds right down to the roots. You should see results in 2- 4 days, especially in this warmer weather. Follow directions on the label to mix the product or you may prefer to buy it in a ready to use spray bottle.
Mint is a lovely plant. If you want to keep a little for yourself before spraying it, It is best grown in a pot so it doesn’t spread.
All the best 🙂
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