Is mint a perennial plant, or do you have to buy plants each year?
Certified GKH Gardening Expert
Yes, mint is a perennial. It can also be invasive so if you're considering adding mint to the garden, you should plant it in containers. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/herbs/mint/how-to-grow-mint-plants-in-your-garden.htm
In warmer zones, at least, they are perennial and will take over the world.