Obtain mint seedlings from nurseries or friends. Mints grow fast. Most gardeners have too much mint and are glad to give it away.
Clear a site in an out of the way area of the garden where your mint is isolated from other plants, or fill a large pot with potting soil. This is the best way to curb their aggressive root growth. Stems can travel long distances underground.
Plan for one species of mint per pot or in one area of the garden. Mints planted together can cross pollinate, eventually resulting in plants with blended flavors, according to University of California Madera County Extension.
Dig a hole in the soil with a hand trowel in the ground or the potting soil, big enough to accommodate the root ball of the mint. Back fill tamping down the soil firmly around the plant. Water deeply making sure the roots are soaked. Water whenever the soil dries out.