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How can you tell if a tomato plant is Underwatered?
Check the soil around the base of tomato plants by inserting your finger in the soil to a depth of 2 to 3 inches. If soil is dry, the tomatoes are under-watered. If soil is soggy, your tomatoes have been over-watered. Soil should feel moist to the touch.
What do tomatoes look like when they don’t get enough water?
Not Enough Water
Just like with too much water, if your tomato plant is underwatered, the leaves will wilt and turn yellow when the plant needs water.
How do I know if my plants need water?
Poke your finger into the soil
One of the easiest ways to check if your plant needs watering is to stick your finger into the soil. This gives you a clearer indication of the soil moisture content than simply looking at the surface. You can reach 2-3in into the soil and feel how moist or dry the soil is.