I start my tomato and pepper seeds on a heated seed mat. I was under the impression that they do not need light until they break through the surface and begin to sprout
. I use a plastic 72-cell seed-starting tray. This is my dilemma: Seeds germinate at a different rate. At what point do I put them under the lights? Will I do damage to the seeds that have not broken the surface yet if I put them under the lights so that the seeds that have popped can benefit from light and to avoid legginess in those that have popped?
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