Environmental issues, such as a lack of water, too much water, poor soil and too little light can also cause tomato plants to fail and die. Watering issues – When a tomato plant is under watered or over watered, it reacts the same way. It will develop yellow leaves and will look wilted.Click to see full answer. Likewise, how do you save a dying tomato plant?Give your tomato plants one inch of water each week; with any less, they will wilt. Water wilting plants to revive them quickly. Move the tomato plants if they are in close proximity to a walnut tree, as walnuts create juglone, a toxin that enters the soil and can kill surrounding plants.Also Know, what do tomato plants look like when they are overwatered? Signs of overwatering include standing water and soil that is very wet and muddy when touched. The presence of wilting leaves and very wet soil indicates the plants have been overwatered. One may also ask, how do you know if your tomato plant is dying? Check the leaves for wilt, discoloring or drop offs. The condition of the leaves and fruit is usually what prompts a grower to question whether his tomato plant is dead. A plant with wilting, dry, yellow leaves may still have hope but is a symptom of a problem and should lead you to investigate further.Why are the bottom leaves on my tomato plants turning brown dying?If early on in the season you notice yellow, uncurled leaves at the bottom of the plant that work their way up – that can signal a nitrogen deficiency or leaves turning yellow or brown higher up on the plant could be early blight. It’s best to do a soil test to determine if it is a nitrogen deficiency.