What wrong with my tomato plant leaves turning yellow?

The Cause. The most probable cause of yellowing leaves on tomato plants is incorrect watering. As the roots are damaged and there is less oxygen in the soil, there is less oxygen available to the leaves, causing them to turn yellow and drop off. Underwatering can also cause the leaves to turn yellow after wilting.

Why do my potted tomato plants have yellow leaves?

Your potted tomato plants are turning yellow because you are overwatering them. Too much water will cause the roots to drown. This means fewer nutrients and oxygen reaches the leaves causing them to turn yellow. The leaves can also turn yellow due to underwatering that will cause similar problems.

What makes tomato plant leaves turn yellow?

Yellowing Leaves. Tomato plants’ leaves may begin to turn yellow during the growing season. There are many possible causes for this: aphids, root knot nematode, one of many fungal diseases, smog or nutrient deficiencies.

What causes yellow tomato leaves?

Causes of Yellowing Leaves. Common causes of yellow leaves on tomatoes include cool soil, age-related death of the lower leaves and a myriad of nutritional deficiencies including nitrogen, boron, potassium, iron and magnesium. Leaves may also yellow when affected by fusarium wilt , bacterial wilt or verticillium wilt.

Why do tomato leaves turn yellow?

Lack of sunlight at the base of the plant

Why do tomatoes have yellow leaves?

A tomato plant’s bottom leaves will turn yellow due to age, nutrient deficiencies, uneven watering, or diseases. Nitrogen deficiency and early blight are common causes of yellow leaves on the bottom of a tomato plant. Of course, there are some steps you can take to prevent yellow leaves on your tomato plants (assuming age is not the problem!).