Lemon balm volunteers all over my yard and I love it! It fills in the empty spaces and I let it grow, as long as I don’t want to plant anything else in that space. Lemon balm does great in the shade or part sun and is often tucked near a larger plant, like under my apricot tree, or in the corner next to my back fence.
Medicinally, it's great as tea or tincture. Use it for calming, colds, during menstruation, and for the gallbladder, liver, gastrointestinal area, and for your heart. I like to drink the tea simply because it's tasty!