The mint family of herbs offers many choices of variety to the home gardener. Spearmint is a versatile type of mint well-suited for use in recipes, and can also be used to flavor hot and cold teas and beverages. Like other types of mint, spearmint is prone to invasiveness if planted directly in the garden bed. Plant the spearmint seeds in pots and continue to grow the plant in a container to prevent it from spreading to unwanted areas of the garden.
Fill 4- to 6-inch diameter pots with a moist, quality potting soil. Leave a 1- to 2-inch space between the top of the potting soil and the rim of the pot.
Sow two to three seeds per pot about ½ inch deep. Spritz the surface of the potting soil with water in a spray bottle to moisten it, then cover it with plastic wrap to hold in the moisture.
Set the covered spearmint pot in a warm room to germinate. Remove the plastic wrap once seedlings appear, approximately seven days after planting.
Place the pot of spearmint in a warm, sunny window. Water as necessary to keep the soil moist but not soggy.
Thin the seedlings so only the strongest and healthiest plant remains in the pot once the seedlings are about 3 inches tall. Pinch off the weaker seedlings at soil level to remove them.
Set the potted spearmint outside once all frost danger is past. Place it in an area that receives full sunlight and water it as the soil surface begins to feel dry, which may be daily during dry weather.