Several sites recommend using a cornstarch gel for planting out delicate barely germinated seeds, or as a medium for germinating them. It's used because after a seed has germinated artificially it will continue to grow even though it's too cold for them to germinate in the ground.
In an area with a short growing season you can gain a couple weeks of growing time by pre-germinating.
The claim is that the gel and sprouted seeds can be squeezed from a bag into the prepared seed bed without damaging the delicate new roots. If you are germinating in a dish of gel, you can spoon a sprout and some gel and place it where you want it. The gel cushions the roots during transfer and provides a small reservoir of moisture for the first few days.
I tried germinating seeds on a dish of gel because my success rate when planting directly is
usually poor. Keeping a garden plot damp during a seedling's delicate early days is not easy in the arid Southwest.
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