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Use a garden hose to thoroughly water new tomato plants after they are set in the ground. Water deeply and then allow the soil to dry out--but not parch. A day after watering new plants, test the soil by poking your finger down into it about an inch. If it is wet, hold off on watering for a while longer (how long depends on how warm the climate is). If it feels only slightly moist, water plants again.
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Lay out soaker
hose near the stems of the tomato plants, leaving about 1 inch between the stem and the hose. -
Turn on your soaker hose system. Leave the water on until the ground around the tomato plants is soaked several inches below the surface. For some soaker hoses with small irrigation holes, this may mean leaving it on for several hours.
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Water tomato plants in the cool hours of the morning when at all possible. Less water evaporates this way--which means more sinks into the soil, where the tomato plants can actually use the moisture.
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Water plants deeply every other day--or more often as needed. Soil type and temperature will play a part in how often you need to water. Test the soil daily to make sure it is not too dry.

