Soil should have abundant phosphorus and calcium, so add lime and compost to the soil three weeks prior to transplanting. Mix ¼-½ cup of complete organic fertilizer into the soil beneath each transplant. Using a clear plastic cloche or floating row cover helps growth by increasing heat. Cool temperatures increase leafy growth, but delay fruit set. Once most eggplants get going in the summer, they are highly productive right up until the first frosts.