This is the "Holy basil" used for thousands of years in Ayurvedic medicine. In India, people grow some near their home to use regularly in teas. It is considered an adaptogen - an herb with so many healing qualities that is felt to be an overall tonic for the body. Leaves. stems and seeds make a wonderful soothing tea that is said to help with stress and anxiety, and the taste mixes well with many other herbs. Also considered anti-inflammatory and anti-oxidant in Ayurvedic medicine.  The plant will freeze back in winter, but if you keep it in a large pot and protect it during freezes, it will continue to grow for a couple of years. Harvest the leaves regularly by cutting it back about 1/3 to 1/2 its size and it will grow back even more lush than before. Sun or part shade, good soil, and regular watering will help this herb to thrive, but it is tough and can be drought tolerant as well.