Last year my tomato seeds failed to germinate. Why? It was just too cold.
I vowed to build a cold frame and this winter I made good on that promise. I’ve upgraded the plastic sheeting on the “germinator” to rigid plastic awning material (plastic sheeting over a flat surface doesn’t do well in rain . . . duh). If I were to build this thing again I’d construct a sloping top, especially if I lived somewhere with actual weather.
|Before–plastic sheeting on a flat surface–a bad idea! What was I thinking?|
The automatic vent lifter (available from Peaceful Valley Farm and Garden Supply) works great, popping open the germinator to keep the seedlings from frying during the day (remember this is Southern California).
The sight of my tomato seedlings was a highlight of the week:
If I lived in a colder climate I might consider incorporating a compost bin inside my cold frame to keep seedlings warm, a heat mat, or growing indoors under lights.