Posted: 05/04/2014 at 20:43
Tootles, I think that if the conditions are too cold then the seeds would just rot in the moist compost.
There is a thread about heated propagators; I am a fan, but some others aren't. I have an electric frost buster heater in my greenhouse so when the seeds have germinated in the heated propagator in the kitchen, they can be transferred to the greenhouse, liberating the propagator for the next batch of seeds. The propagator has 7 little troughs with lids and cost about £30.