I often hear people speak of putting seeds in a sunny window. Or providing artificial light. Or any other bad idea . . .
Most seeds need dark, not light. That is one reason that we cover seeds that we direct-plant in the garden. That covering of soil excludes light. It also retains moisture, which is one of the keys to germinating seeds in the greenhouse. The other key ingredient is warmth. Typically we would have to wait until the soil reaches the proper temperature before direct-sowing in the fields. But we cheat this process by using germination mats. These allow us to start some seeds in January.
If you decide to start a few seeds this early without a greenhouse, please remember the following:
- Keep the soil evenly damp, but not wet
- Exclude light until the shoots break the soil level
- Even, moderate temperature is best. 75 F will work for most
After the shoots appear, light is important. But if that sunny window is too cool, be careful. Do not allow the plants or their container to contact the glass. You will probably find that it is best to put them someplace warmer as soon as the sun sets each night.