3. Place your tray of herbs in a south-facing window. Herbs need at least 5 hours of bright, full sunshine a day to stay healthy, and sometimes the low winter light just isn't enough. For the best results, place your herbs under fluorescent lights for 14 hours a day. Keep the lights 6 to 8 inches away from the tops of the plants. Basil, chives, oregano, rosemary, sage, and parsley can all be grown indoors.