Tomato plants need plenty of sun--at least 6-8 hours of direct sunlight daily. They also need good air circulation. Select a place in the garden that receives full sun and has well-drained soil. Avoid planting tomatoes in the same spot year after year, as this can make them more susceptible to disease. Space plants 2-3 ft. apart and in rows 4-5 ft. apart. If growing tomatoes in containers, select a place that receives at least 6-8 hours of direct sun daily.