Lettuce Leaves Turning Yellow

Lettuce leaves turning yellow can be indicative of a variety of problems. Lettuce leaves turn yellow when the plant is stressed. This can be caused by a lack of light, water, or fertilizer.

The most common issue is waterlogging, which can occur due to a number of factors including heavy rains, high humidity, and inadequate drainage.

Over-watering also causes wilting and browning of leaves. Fungal infections, such as Botrytis cinerea or Phytophthora capsici can cause lettuce leaves to turn brown and die.

Other causes include lack of nitrogen, overuse of fertilizers, and viral infections.

Why Are My Lettuce Leaves Turning Yellow? – How Can I Fix It?

Lettuce leaves can turn yellow and fall off the plant in a number of ways, including from waterlogging or wilting. There are a few causes for this problem, but most often it is due to nutrient deficiencies or poor soil.

Fortunately, there are several things that you can do to help prevent lettuce leaves from turning yellow and falling off the plant.

Reasons of Lettuce Leaves Turning Yellow

There are number of reasons lettuce leaves turning yellow

Heat Stress

Heat stress is also a reason to lettuce leaves turning yellow. Lettuce is a cool-season crop and can require more water in hot weather to stay healthy.

Overheating can cause wilting, yellowing and even death of the leaves. Lettuce leaves turn yellow and wilted under the hot sun because they are not able to cool down quickly enough.

Heat stress is also a reason why plants may not produce flowers or fruit. The leaves close up, exposing the cells to less light and heat, which can cause damage. Cooling the plant as quickly as possible will help it to recover.


Water is essential for plants to survive, but some problems with water can cause leaves to turn yellow. Lettuce can start to die or turning yellow if it’s getting either too much or too little water.

Lettuce should not be allowed to go dry and should be watered at least twice a week during the growing season, but more often during the summer.

Overwatering will cause lettuce to rot, while under watering will cause it to turn yellow and become tough. Too much or too little water can lead to yellowing. When water isn’t available, plants will turn to their stored energy to survive.

This process can release chlorophyll, which turns leaves yellow.

What Are The Most Common Nutrient Deficiencies That Lead To Lettuce Leaves Turning Yellow?

A nutrient deficiency is a lack of one or more essential nutrients in the diet. This can lead to lettuce leaves turning yellow or brown. Lettuce leaves turn yellow when they are deficient in one or more of the following: nitrogen, potassium, magnesium, calcium, and phosphorus.

Nitrogen is most commonly deficient in gardens because it is a plant nutrient that is necessary for establishment and growth, while calcium and phosphorus are often deficient because they are required for healthy leaf growth.

Magnesium and potassium deficiencies are less common but can still occur when insufficient amounts of these nutrients are added to the garden.

What Pests And Can Cause Lettuce Leaves To Turn Yellow?

Lettuce leaves can turn yellow and fall off the plant due to many different pests and diseases. Some of the most common pests that cause lettuce leaves to turn yellow are

  • Aphids
  • Borer
  • Leaf hoppers
  • Spider mites

Other causes of yellowing and falling leaves on lettuce plants include cold weather, lack of water, and severe nitrogen deficiency.

What Diseases Can Cause Lettuce Leaves To Turn Yellow?

Lettuce leaves can turn yellow due to a number of diseases, including bacterial wilt and viruses. However, the most common cause of yellowing is leaf spot, a fungal disease caused by the fungus Alternaria brassicae.

Leaf spot causes the leaves to turn brown and develop lesions that make the leaves vulnerable to infection by other fungi. Lettuce is a common vegetable that is eaten as a salad or as part of a meal.

Lettuce leaves can turn yellow and become wilted if the plant is infected with a virus, fungus, or bacteria. There are many different diseases that can cause lettuce leaves to turn yellow, and each one has a different cause and requires a different treatment.

Also Read: How To Treat Rust Disease On Plants?

What Environmental Factors Can Lead To Lettuce Leaves Turning Yellow?

There are a few environmental factors that can lead to lettuce leaves turning yellow. One of these is water scarcity. When the soil is dry, the plants’ ability to uptake water from the soil decreases, which can cause the leaves to turn yellow.

Over-watering also causes this issue, as does fertilizing with high levels of nitrogen. A lack of sunlight can also cause leaves to turn yellow, as can pollution or a cold winter.

Additionally, high levels of nitrogen in the soil can also cause this issue. Lettuce is a legume, which means that it absorbs nitrogen from the soil.

Also Read: How Does Gardening Help The Environment?

Lettuce Leaves Turning Yellow

How To Save Your Lettuce From Turning Yellow?

Lettuce leaves can turn yellow and become dry and crispy if not properly cared for.

Here are some tips on how to fix and treat lettuce leaves that turn yellow:

1. Rinse the lettuce in cold water to cool it down.

2. Spread a layer of compost or manure over the surface of the lettuce and work it into the soil with your hands.

3. Water the lettuce well and let it soak up the water.

4. Cover the lettuce with a layer of mulch to help retain moisture.

5. Add a liquid fertilizer, such as fish emulsion or seaweed extract, every two weeks.

6. Place lettuce plants in a location that receives plenty of sunlight.


If your lettuce does turn yellow, don’t worry too much, as it will still be edible. There are a few things you can do to help save your lettuce from turning yellow.

Try planting your lettuce in a sunny spot, water it regularly, and give it plenty of nitrogen. Apply a layer of mulch to the soil to help keep it moist and cool. Fertilize the plants with a balanced fertilizer every two weeks.

And finally, harvest the lettuce when it’s young and tender.  Just make sure to harvest it before it goes to seed. By following the advice in this article, you can ensure that your lettuce stays healthy and green all season long!