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Tomatoes in gardens have an advantage over container plants -- they can spread their roots out far and deep in search of water. Even so, the same rule of thumb about even soil moisture applies. Tomato plants need about 1 to 1 1/2 inches of water each week to fruit, according to Ohio State University. There's no need to measure, so long as you maintain an even soil moisture. At the beginning of the growing season, this may mean watering in the morning until the soil is thoroughly damp and remains damp all day.
Watering Technique. Tomatoes do best when the soil is thoroughly soaked. During each watering, the water should reach a depth of 6 inches to 8 inches, the North Carolina Cooperative Extension advises. Instead of daily waterings when only the soil surface receives moisture, water the plants deeply once per week when rain is not forecast.