- Start tomato seeds indoors 6-8 weeks before the last frost of spring, sowing the seeds in a flat 1/4″ (8 cm) deep and 1″ (30 cm) apart. Keep the temperature at 20 °C (70-75 F) until germination, as well as providing adequate light in a sunny window.
- Keep the soil moist, but make sure drainage is adequate. When the second set of leaves emerges, transplant the seedlings into individual pots; bury the stems up to the lowest set of leaves to grow strongly rooted plants.
- Set transplants outdoors in the shade for a couple of hours the first day. Gradually increase the amount of time your plants are outside each day to include some direct sunlight.
- Transplant after last spring frost when the soil is warm. Plant transplants about 2 feet (60 cm) apart.
- Pinch off a few of the lower branches on transplants, and plant the root ball deep enough so that the remaining lowest leaves are just above the surface of the soil.