Basil needs plenty of sunlight. Also, remember that as soon as leaves mature, pluck them off. The more you pluck, the more it will grow. I let mine flower, and as the seeds dry out, I just press them into the dirt around the plant. Basil does not have deep roots. You can put several plants in one pot. Just about the time that the new seeds have sprouted and started growing into good size plants (about six inches tall or so), the old one will start to die out. This way, they stay in a continuous cycle, and I always have plants ready to be plucked. Miracle Gro once a week, and water with any leftover coffee once or twice a week. Basil plants love coffee!