Begin with viable seed from a reputable source. Plant the seeds in containers using a soilless seed-starting mix. Keep the soil moist during the germination stage. Secure fluorescent lights 4 to 6 inches above the soil surface. As the seedlings grow you will need to adjust the lights to maintain this distance. Keep lights on for 14 to 16 hours each day. Alternatively, if you have a south-facing window that receives at least six hours of direct sunlight this may be option. If grown using natural light through the window, you will need to rotate the containers as the plants grow to promote uniform growth. Also, be sure the window isn’t drafty. Herbs prefer a daytime temperature between 65- and 70-degrees F and nighttime temperature between 55- and 60-degrees F.
The air in our homes can become very dry during the winter which is detrimental to growing herbs. You can create microclimates with higher humidity by grouping multiple plants close together. Another option is to use a humidifier near the plants. Air circulation is another concern which can be remedied by using a small fan.
Indoor growing conditions are obviously not ideal for growing an herb garden. However, it is an option for gardening during the off-season. Using best practices for the situation and managing expectations is important for determining success.