“ When we bought our house 2 years ago, the previous owners had planted mint in the ground, despite having a raised garden bad. My wife and I spent an entire afternoon taking back mulch and digging to remove the mint. We built a 2nd garden box and put it over the top of the mint spot, but I’m already seeing bits of mint poking up from under the box…”

That’sthe comment beneath ypurs and it explains the problem