Most herbs are easy to grow, and this is definitely true for peppermint. Square stems tend to run rampantly over the soil. In small garden spaces, it's best to tuck peppermint into a pot to curtail its growth. Peppermint thrives alongside water gardens or in damp spots in the yard, but will also survive in drier soil. Lushest growth occurs in moist soil in partial shade. Crush fresh leaves into water for a refreshing beverage, or add to iced tea. You can also dry leaves for flavoring dishes or beverages and making desserts. Pick leaves frequently. Plants open lavender blooms in late summer. Repels pests, helping to protect other plants in the garden.
The best way to grow any type of mint is to plant it in a pot (an 8" to 10" diameter plastic nursery pot works well) and then sink the pot into the soil in the raised bed, leaving the top 2" of pot exposed. This confines the roots and prevents them from spreading into the surrounding soil. Plant spearmint near the edge of your raised bed and the stems will cascade nicely over the edge. Note that you'll want to keep the plants' stems pruned to minimize soil contact, because they'll start to root wherever they touch the soil. Be sure to use these flavorful prunings!