When growing eggplant, or any vegetable plant, indoors, use mature plants from a reputable greenhouse, for the best results. Start your eggplants off right with the best chance of survival by using established plants. Insects, like aphids, caterpillars and spider mites, like to feast on eggplants. Planting them indoors provides some extra protection from insect infestations common outdoors.
Pour a 1-inch layer of gravel into the bottom of a 5-gallon container. Fill the remainder of the container with a premium potting soil, with added fertilizers.
Dig a hole in the middle of the container's soil large enough for the roots and the base of the eggplant. Remove the eggplant from its growing container and place it in the hole. Spread out the plant's roots in the hole. Pack soil firmly around the roots and the base of the plant. Water the container until water comes out of the drainage holes.
Place a tomato cage in the soil. Push the stakes of the cage into the soil around the perimeter of the plant.
Spray the plants daily with a light stream of water until the soil appears moist. Refrain from watering on days when the soil still looks moist.
Place the container in a south-facing window where it will receive the most sunlight. Turn the plant every few days to give the plant access to sunlight on every side. If possible, grow the eggplant under a set of grow lights. Eggplants prefer full sunlight and most indoor natural light is not sufficient enough for eggplants to thrive.
Pick eggplant fruits when they are uniformly colored, glossy and firm.