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Starting Eggplant Seeds Indoor.When starting your eggplant seeds indoors, be sure you have an area to germinate them that is quite warm, 80-90 F. (26-32 C.).Eggplant seed planting should occur four to six weeks before your last frost date.Although eggplant seeds are tiny, sow the seeds about ¼-inch (6 mm.) deep with good quality potting soil in flats or cell containers.Use a dome or cloche to retain heat as well as humidity to encourage germination when eggplant seed planting indoors.At optimal conditions, the growing eggplant seeds should germinate within seven days. Two weeks after germination, fertilize the seedlings once a week with a soluble fertilizer.Eggplant seedlings will be ready to transplant in six to eight weeks. Harden off the seedlings carefully by gradually reducing ambient temps and easing off on watering.Wait until the weather has settled, with no chance of frost and the soil is warm before transplanting.How to Transplant Eggplant Seedlings.Once your eggplant seedlings are ready to move outdoors, choose a full sun area with a soil pH of 5.5 to 7.0 (acidic to neutral).Consider using a raised bed or black plastic mulch to aid in warming the soil and speeding up growth.You can also use an organic mulch to retain moisture, but don’t apply it until the soil is warm.