Why Do My Tomato Plants Turn Yellow at the Bottom?

Tomatoes are some of the most popular garden crops, but it can be frustrating to see yellow leaves at the bottom of your plants. This is a common problem across tomato varieties and can be caused by several factors.

Lack of Water

One of the main reasons for yellowing leaves is a lack of water. Tomatoes require consistent moisture, and if your plants are not getting enough water, the lower leaves may start to turn yellow and wilt. Make sure you are watering your plants deeply and regularly, especially during hot and dry weather.

Nutrient Deficiencies

Tomatoes also require specific nutrients to grow and produce healthy fruit. If your soil is lacking in these nutrients, your plants may start to show signs of deficiency, including yellowing leaves. The most common nutrient deficiencies in tomatoes are nitrogen, magnesium, and calcium. Consider performing a soil test or adding organic matter and fertilizers to improve soil quality.

Root Rot

Root rot is a fungal disease that can affect tomatoes and cause yellowing leaves, as well as wilting and stunted growth. This disease occurs in soil that is consistently wet and poorly drained. To prevent root rot, make sure your plants are growing in well-drained soil and avoid overwatering.

Bacterial Canker

Bacterial canker is a serious disease that can cause yellowing leaves, stem cankers, and fruit rot. It is caused by a bacterial pathogen that enters the plant through wounds or natural openings. Unfortunately, there is no cure for this disease, and infected plants should be removed immediately to prevent spread.

Tomato Blight

Tomato blight is a fungal disease that can cause yellowing leaves, leaf spots, and fruit rot. It is spread through spores that can be carried by wind and rain. To prevent tomato blight, make sure your plants are spaced properly, and avoid getting water on the leaves when you water your plants. If you notice signs of blight, remove infected leaves and fruit immediately.

In conclusion, yellow leaves on tomato plants can be caused by several factors, including lack of water, nutrient deficiencies, root rot, bacterial canker, and tomato blight. It is important to identify the cause of the issue and take steps to correct it to keep your plants healthy and productive.