Most varieties of tomatoes will not set fruit unless the average nighttime temperature stays above 55 degrees. If nighttime temperatures are expected to drop below 55 degrees, protect the plants using a polyethylene film. The soil for tomatoes should be well drained and fertile. One of the most important nutrients is phosphorus. If commercial fertilizers are used, allow 2 weeks before setting in transplants.
Most gardeners start tomatoes with transplants.
In the garden, tomato seeds are hard to germinate. Transplants that are purchased should be stocky and not leggy. Healthy plants should have 4-6 young true leaves. Avoid plants with blooms or fruit. When planting, set transplants deep.