Most of the mints we use today, including spearmint, came to North America with the Colonists. They used mint teas medicinally for headaches, indigestion and to help them sleep. Mint is also an excellent culinary addition and makes a great teas for the pure pleasure of it. As a general rule, mint family plants root vigorously when allowed to grow freely and can be invasive. Grow them in containers to keep them in check.