Lemon balm is very easy to grow, and it’s a good starter plant for a herb garden. Since it grows abundantly, the best way to start your own patch of lemon balm is to get some from a friend. It will increase in size every year, and you may find that you have many friends who would like to donate a little to your herb garden. If you don’t know anyone with lemon balm, you can start it from seed under lights in a room that is at least 70 degrees. Start it 6 to 8 weeks before the last frost, and plant it outside when the soil warms.