Answer: Impatiens can take up to about three weeks, but petunias usually only take half that at most, so there is a problem. The soil mix should be barely damp (excess moisture can cause rotting) and for these plants, the soil temperature should be fairly warm, in the 75 degree range for best results. Since soil temperature tends to be about five degrees cooler than the room temperature, most gardeners will use a source of bottom heat for these seeds. Keep in mind too that overheating can "cook" seeds.
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