excel: technically, one does not need light for germinating seeds. However, as soon as they break ground, certain dynamics take over. Virtually, all plants fall into categories of Photoperiods. Furthermore, weak and/or spindly seedlings rarely make good plants. Therefore, the medium (usually soil) temperature is quite key. One needs to have a good correlation between air heat and bottom heat. It's rather simple, but usually ignored. I hope this helps.
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"When in doubt, empty the clip."