Pick a location outdoors that receives partial shade or full sunlight. Mint grows best in rich and moist soils.
Add 2 to 4 inches of compost and an all-purpose fertilizer to the location and work it into the soil 6 inches deep. Follow the fertilizer directions carefully before you apply it to the soil.
Sow the Corsican mint seeds one-fourth of an inch deep in the soil. Water the soil to keep it moist.
Thin the mint seedlings once they emerge. Space the mint seedling rows 2 feet apart and the plants 10 inches apart.
Water the soil with 1 to 2 inches of water each week unless adequate rainfall occurs. Let the soil dry slightly between each watering to prevent root rot from forming.
Apply a slow-release fertilizer in the spring to encourage the plant to grow. Follow the directions on the fertilizer carefully before applying it. Utah State University suggests adding 1 teaspoon of 16-16-16 fertilizer to each mint plant.