Choose a spot in the garden in which to grow the Corsican mint. Dappled sunlight, such as that beneath a tree or a taller plant is ideal.
Add 3 inches of sand to the top 6 inches of the garden soil and blend it well.
Plant the Corsican mint at the same depth it's growing in the nursery pot. If planting more than one, space them 10 inches or more apart.
Water the Corsican mint after planting. Slow, deep watering is best, so if you have a soaker hose, place it around the Corsican mint and run it until the soil is wet to a depth of at least 10 inches. Never let the soil dry out or the mint will die.
Fertilize the Corsican mint in early spring and early fall. Use a 10-10-10 fertilizer according to package directions. Rinse off any fertilizer that lands on the foliage and water after applying.