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While temperatures are below freezing and snow still swirls around, now is a good time to start spring seedlings indoors. They can later be transplanted outside for optimal growth when spring arrives. Horticulturists with Iowa State University Extension and Outreach, recommend a germination medium that is lightweight, porous and free of pathogens. Commercially prepared soilless mixes are recommended, like Jiffy Mix. Also, use a high quality, well-drained mix when transplanting seedlings to individual pots. A variety of containers can be used to germinate and grow transplants, including cut-off milk cartons, paper cups and egg cartons. Remember to punch holes in the bottom of containers to allow for drainage. Temperatures should be kept between 70 and 75 degrees for most seeds to germinate. For lighting, they recommend a standard fluorescent shop fixture containing two 40-watt tubes (one cool white and one warm white) and they should be four to six inches above the plants. The lights should be on 12-16 hours each day.