Like all mints, Banana Mint, should be confined to a pot. Mints grow better in pots with lots of surface area rather than lots of depth. Mint grows so rapidly that it will need to be divided and repotted with fresh soil each spring. Learn more about dividing and repotting mint.
This plant is sometimes available in plug trays. These trays hold 128 of all the same plant. They are a great low cost way to fill a lot of space. Each cell is 3/4 of inch by an inch. Check here to see if Banana Mint Plug Trays are available.