Answer: The length of time depends on what you are trying to grow, but a typical time frame might be eight weeks prior to the last average frost date for your area. The seed packets often include an indication of weeks for the specific plant in question. Although your basement may seem bright, most gardeners do find it necessary to add supplemental lighting on a timer for about sixteen hours a day in order to produce good quality, healthy seedlings indoors. You might keep an eye on your plants and consider that if they seem to be "leggy".
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