To grow it indoors, sow seeds in a flat. Cover them with a moistened, sterile mix not more than twice the size of the seed. Keep the soil near 70 degrees. Once seeds start to germinate at five to seven days, keep the plants at 70 degrees or above, and keep the soil moist. When seedlings have at least two pairs of true leaves, transplant them to 2-inch pots.
Basil grows best in full sun and needs well-drained, rich soil.
Plants started indoors and hardened off in May can be planted outside about 12 inches apart. Under the right conditions Mulching the area will not only discourage weeds, but will maintain the soil moisture, keeping the plant healthy. Basil prefers a soil pH of 5.5 to 6.5. Fertilize it sparingly, as this decreases the fragrant oils. To encourage a bushy, healthy plant and to improve production, don't be afraid to prune basil.