Heat mat to start caladiums: leave on 24 hours a day?
The heat mat I ordered just came. It is a seed starting heat mat, but that is the only kind I could find for this purpose. I have it set up on top of a thick sheet of corrugated cardboard, on top of a thickly folded bath towel, to avoid having heat sucked away by the table it's on. The flat with the caladiums is on top of the mat, then the clear plastic cover that came with the flat; which is also covered with a few layers of towel to keep it warmer.
But...do I leave it on round the clock, or use a timer to give it a certain amount of time off (like have it turn off during the warmest part of the day) ?
The bulbs are planted in a peat / potting soil mix, in shallow flats, set inside the larger standard sized flat. I trickled a small amount of water in, but was afraid to make the soil too wet, since the water will be trapped until I raise the lid.