If you are really determined to grow your own transplants, there are a few things to remember that may make it a little easier and more successful, he suggests. First, the more you enjoy working with plants, the more likely you will be successful. Second, be sure you have a large area that gets lots of sunshine. A coffee table in the living room, or a wide window sill in the bedroom should not be considered a replacement for a greenhouse. Most seeds can be germinated in a small flat set on the fridge or furnace, he says.
Bottom heat is normally the most critical factor.
It is also important to make sure the seeds get sufficient moisture, but never let them stand in water. Be sure to read the package, since some seeds germinate best in light and should not be covered with soil. Speaking of soil, a good potting or seed starter mix purchased from a nursery works well, or you can make your own by combining sand, peat moss and vermiculite or pearlite. Once the seeds germinate, move them immediately to a sunny location to prevent leggy plants, Goodspeed says. Most homes are too dark and too warm at night.