Starting gardens indoors requires a great deal of work and time, which is why most people leave growing bedding plants to greenhouses and nurseries, says Jerry Goodspeed, Utah State University Extension horticulturalist. Still, there are many reasons one might decide to start growing bedding plants indoors. By growing bedding plants its possible to grow varieties that may not be grown by local growers. They need a very light potting soil. Starter soil mixes can be purchased from the local nurseries.
Some people put their seed flats on top of a furnace or freezer.
This helps warm the soil to promote good germination. Be sure to read the seed package label in order to provide optimal germination requirements, and never over-water the seeds. Once the seeds germinate and the plants start to appear, they will need as much light as possible. Lighting is the major obstacle for most people who are growing bedding plants because windows usually don't provide enough light to allow for proper growth and development of bedding plants. If a greenhouse or atrium is unavailable, he says grow lights or good flourescent lights can be used.