Answer: I does sound like an invitation to electrocution, doesn't it? Most seeds germinate best in warm soils. The use of heating cables or pads under the trays keeps the soil temperature at about 70F degrees. However, once the seeds have germinated, they need light and water more than they need bottom heat. So my suggestion is to put your capillary mats in the bottom of the trays, add potting soil, plant seeds and water everything well. Then put the trays on the heating mats. After the seeds have germinated, remove the bottom heat source and begin watering as planned.
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