Additionally, when growing basil indoors, lighting is important. Basil growing indoors requires at least six hours of sunlight. Basil plants should be placed in a sunny window, preferably facing south. Otherwise, these potted plants may need to be grown under fluorescent lights. With this type of lighting, basil plants will need about 10 hours of light for healthy growth. However, basil grown indoors can also be given both sun and artificial lighting by alternating so many hours in each.