How to Grow Kentucky Colonel Spearmint

Choose an area to plant Kentucky Colonel spearmint that has a rich, moist, well-drained soil and is in full sun to partial shade. Prepare the soil before planting by applying 2 to 4 inches of composted manure and 1/2 tablespoon of all-purpose fertilizer per square foot. Work the manure and fertilizer into the soil 6 inches deep.

Plant Kentucky Colonel spearmint in the spring after danger of frost has passed. Sow seeds 1/4-inch deep and water lightly to moisten the soil. Keep the soil moist. Thin seedlings once they emerge to allow at least 2 feet of space between the plants.

Water the spearmint plants regularly throughout the growing seasons to supplement rainfall. The plants require up to 1 to 2 inches of water per week. Avoid overwatering as it may create conditions for disease. The soil should be moist but not soggy. Water frequently during hot, dry weather to ensure the soil stays moist.

Feed established Kentucky Colonel spearmint in the early spring with a slow-release, complete fertilizer, such as 16-16-16. Apply 1 teaspoon of fertilizer to each plant.

Inspect the spearmint regularly for signs of pests and disease, such as damaged foliage, webbing on the plants or discoloration. Diseases that may affect spearmint include powdery mildew and rusts. Common pests are aphids, four-lined plant bugs and Japanese beetles. Consult your local county extension office for advice regarding pests and disease.

Use a sharp knife or scissors to remove Kentucky Colonel spearmint leaves and leafy stem tips for use at any time after the plant reaches a height of 3 to 4 inches. The spearmint can be stored up to a week in water in the refrigerator. To dry the leaves, cut them just as flowering begins. Hang the leaves upside down in a hot, shady location until they are brittle, or spread them on a screen in a dimly lit, cool area until they are dry. Dried mint can be stored in an airtight container for up to a year.