9 Causes Of Yellow Tomato Leaves And Their Solution

When a formerly healthy plant turns yellow, panic ensues, resulting in rushed remedies that sometimes do more damage than good. Many tomato growers have seen tomato leaves and bamboo plant turning yellow at some point throughout the growing season.

As a rule of thumb, the issue is simple to remedy (as overwatering) or does not warrant concern at all. It is the most typical cause of yellowing tomato leaves. Your plants will quickly return to normal if you can find the source of the issue and address it.

It may be difficult to pinpoint the exact cause of yellowed leaves on tomato plants since there are many possibilities, and it often involves trial and error. Learn what to do if your tomato plants have a few yellow leaves, and don’t be alarmed if your plants have a few yellow leaves like zz plant yellow leaves which does not need attention until situation get worst.

The Cotyledons of Tomato Seedlings Are Dying

Tomatoes begin their life cycle with cotyledons; a little set of spherical leaves that form the base of their stem (this is true for other plants too). The tomato plant’s development and nutrition depend on the presence of these starting leaves.

The first genuine leaves appear on the tomato seedling as it matures. Tomato plants have oval, multi-lobed leaves like this one. The plant’s real leaves, on the other hand, give even more support. Tomato seedlings take off and flourish at this point.

There are no longer any requirements for the plant’s cotyledons, and they are free to fade, wilt and die. Do not be alarmed if you see yellowing leaves on your tomato plant; they refer to cotyledons since they don’t form like typical tomato leaves. Because of this, your tomatoes are doing rather nicely. One of the other problems tomato seedlings suffer may be yellowing the other leaves on your seedlings.

Why my tomato is leaves turning yellow:

It is simple to resolve the issue that causes tomato plant leaves to become yellow in most cases. As you can see here, yellowing tomato leaves cause by a variety of things.

Pathogenic fungi

Yellow leaves on tomatoes cause fungus. The illness is quite severe; fruit is typically unharmed. On the other hand, late blight, which begins on the top leaves, is a more complex disease. On both leaves and stems, massive, greasy sores identify late blight. The plant’s growth is slow, and it is unlikely to bear fruit.

A fungus may use a fungicide containing chlorothalonil treat this and other fungal infections. Take care of your water supply. Plants need room to breathe, so leave plenty of space between them and thin down any overgrown growth.

Diseases caused by the spread of viruses

tomato in basket

In general, tomato virus symptoms include reduced development and a mosaic pattern on the leaves. Pests including whiteflies, thrips, and aphids, as well as tools and hands, may spread viral infections. Plants are at risk of extinction if infected with a viral illness.

There are no chemical controls, however. If you can’t get rid of the diseased tomato plant leaves, you may need to start again with a different portion of your garden and plant disease-resistant kinds. Maintain regular pest control and watering schedules.


A wide variety of pests may cause tomato plant leaves turning yellow, a common symptom. More minor pests, such as the following, respond well to insecticide soap or horticultural oil.

  • Aphids
  • Thrips
  • The spider mites
  • These are flea beetles.
  • Whiteflies

There are also other animals that affects your tomato plant like Squirrels people usually confused that do squirrels eat tomatoes and answer is squirrels will occasionally eat only a portion of a tomato and leave the remainder.

Problems with Water Supply causes yellow tomato leaves

tomato leaves turning yellow

The Factor

Incorrect watering is the most likely cause of yellowing leaves on tomato plants. Many gardeners get it wrong when watering their plants, either by overwatering or underwatering. Gardeners may over-water plants out of concern that the soil may get too dry in their attempts to keep the plants happy.

The roots might get rotted if there is too much water in the soil. When the roots harm and the soil deplete oxygen, the leaves begin to yellow and eventually fall off. After withering, the leaves may become yellow as a result of underwatering. If the plant is submerged, the leaves will become yellow and eventually fall off the plant.


Assessing your watering practices is the best way to determine whether watering is the problem. As a general rule, if you watered when the soil was still wet, or if the soil became soggy, you’ve probably overwatered. Underwatering may cause withering leaves and a drooping plant.

The health of your tomato plant leaves depends on proper irrigation. Make sure to check the soil every day and only water the plant until the top 1 or 2 inches of soil are completely dry. A morning watering recommends keeping the leaves healthy and avoiding evaporation damage.

Slowly and thoroughly water the soil around the roots, not the leaves, to foster deep root development and saturate the soil.If overwatering is to blame and the issue persists, you may be dealing with root rot, which is a severe condition.

Tomato plant root rot

It can no longer save plants due to the current state of the environment. Digging up the plant and removing the rotting roots will allow you to replant it in fresh ground. However, depending on how much the root remains and the plant’s development, it may be advisable to start again.

Compaction of Soil causes yellow tomato leaves

tomato plant leaves turning yellow

The Factor

Soil with insufficient aeration around tomato plant leaves causes a similar issue. Roots begin to suffocate due to a lack of oxygen. It cannot transport the plant’s oxygen, water, and other nutrients via the roots. The yellowing of the leaves is an indication that the plant is nearing its end.


You may be able to loosen the dirt with your hands and aerate it depending on the depth of the roots. It is, however, possible that this may do more harm to the root system. It may avoid this issue.

Seeds sow in soil that amends with organic matter for the most part. Growing tomatoes in raised beds or big pots may help alleviate soil compaction, which is commonly the result of barefoot stomping.

Transplant Shock causes yellow tomato leaves:

tomato plants yellow leaves

The Factor

Transplant shock is most likely the reason for yellowing leaves at the plant base if you’ve just transplanted your seedlings (within the last week or two). When seedlings transplant from a warm environment (such as a greenhouse) to a cold one (the ground outside), they require time to adapt.

Some of the plant’s lower leaves may turn yellow due to the shock. As it turns out, the adjustment period is just a matter of time. There is no need to be alarmed if the new growth is healthy and green. The plant will ultimately recover its health, and the yellow leaves on tomato plants epsom salts will fall off.

Treatment for yellow leaves on tomato plants:

yellowing leaves on tomato plants
Preventing transplant shock is better than dealing with an issue that can’t fix after it detects. Check the soil temperature and nighttime temperatures before transplanting (below 50F).

You can help a plant recover from transplant shock by removing yellowing stem leaves. It will help focus the plant’s energy on the much-needed new growth and away from attempting to keep the withering leaves alive.

Conditions That Contribute to yellow tomato leaves

yellow leaf on tomatoes

The disease is another sneaky reason for yellowing leaves. It is challenging to eradicate many illnesses that produce tomato plant problems yellow leaves Australia once they have taken hold. The fungus that causes early blight is the first culprit.

As it turns out, this is a simple issue to identify. A pale-yellow spot on the lower leaves will develop into a dark brown area with yellow edging. The whole leaf would turn yellow as well as die if not treated. One of the first warning signs of early tomato disease.

Similarly, marked leaves see on Septoria leaf spot, another fungus-caused illness. If this fungus is present, damaged tomato plant leaves turning brown joined by yellow patches. The condition can spread from the leaves to the plant’s stem if it isn’t taken care of.

Fusarium wilt:

When fusarium wilt invades the roots of a plant, it blocks the flow of water to the plant’s stemsand leaves. Even if the soil is adequately moist, the plant will seem wilted, and its leaves will begin to fall off in clusters.

Early blight and Septoria leaf spot share many of the symptoms of Verticillium wilt. Pale yellow dots & tomato plant leaves turning brown and curling are beginning to appear on the undersides of the lower leaf surfaces. Once the tomato plant yellow leaves brown spots appear, the plant’s leaves will drop.

The bacteria-caused disease called Bacterial wilt sees, prevalent in sandy soil when it’s wet. When a plant is transplanted, the disease usually starts to take hold, but the symptoms don’t appear until later in the season. The plant’s leaves abruptly turn yellow, and it begins to wilt.


It should treat your tomato plant leaves immediately if they show indications of illness. If you don’t address the issue right away, it has the potential to spread across your whole garden and to other plants. It may control early blight and Septoria leaf spot if they find early enough.

Discard the infected leaves to keep them away from your other plants. Fungicides may be used following product directions, but only if the problem resolves. There are three types of “wilts,” and if any of them appear, you’ll have to get rid of the plant.

These illnesses have no known treatment, and they will spread if given a chance. Remove the afflicted plant carefully to prevent spreading the disease to other plants. You can take steps to reduce your chance of contracting illnesses, but prevention is impossible.

Keep the plants apart, so the leaves don’t come into direct contact with one another. Keep your gardening equipment clean and rotate crops for healthy soil.

A lack of essential nutrients:

yellowing tomato leaves

The Factor

A nutritional deficit may be to blame if none of the other issues explain your fading leaves. It causes a deficiency of a macro or micronutrient in the soil or an issue with the plant’s capacity to absorb the nutrient. Nitrogen is the primary cause of yellowing leaves among macronutrients.

A plant’s ability to grow and produce new leaves relies on the availability of nitrogen. The plant’s elder leaves will turn yellow if it doesn’t acquire enough nitrogen. If the plant’s growth slows down beyond this point, the problem is likely one of nitrogen deficiency.

Chlorosis, a disorder in which the leaves become yellow due to a deficiency of specific micronutrients, is another cause of yellowing leaves. Photosynthesis hampers when the tomato plant leaves lacks magnesium, iron, and sulfur, or zinc, essential micronutrients.

Leaves yellow while veins stay green as a result of this.Tomato plants show signs of chlorosis if their leaves become yellow.


Apply a general fertilizer if you feel a nutrient deficit is an issue. Most all-purpose fertilizers include a sufficient amount of nutrients to compensate for any deficiencies in the soil. Soil testing is the best way to be sure. It will show you where the issue is coming from and provide you with the information to find a solution.

It may apply Epsom salt to the leaves to address magnesium deficiency. By not doing a soil test, you may wind up hurting the plant even more by using solutions that aren’t required. A soil test may also help determine whether the plant is the issue or if the soil is the problem.

Keep in mind that a plant’s nutritional deficit isn’t necessarily due to soil issues. There may be a problem with the plant’s roots, rather than with the soil itself, preventing it from getting the nutrients it needs. Ensure your watering practices and soil aeration are correct if a soil test shows no deficit in the soil.

It’s the Season’s Finale.

Consider the season before going through each of these situations and making a million adjustments. Is the tomato season coming to an end? There is nothing to worry about if this is the case. Because they are a natural part of the plant’s lifespan, they signify the end of production.

The remaining fruits on the vine will mature faster if you cut down on the new growth and withering leaves as the leaves begin to fall. There is no need to worry when confronted with a gardening emergency. You’ll be able to tell whether your plant has a problem based on the indicators listed below, your examination of the plant, and your regular care routine.

Take your time while trying to repair yellowing leaves so that the plant has time to acclimatize before moving on to the following remedy. You’ll need to take action quickly (but luckily, diseases are generally easier to identify).

It’s a game of learning through making mistakes. If a remedy doesn’t work, try a different one until the plant is back to its normal functioning state. In no time, you’ll be able to diagnose tomato plant leaves issues like an expert and solve them quickly and easily.

A lack of sunlight causes the yellowing of tomato seedling leaves.

As soon as they establish, tomato seedlings have much growing to accomplish. Tomato seedlings need enough sunshine to continue growing. The ideal amount of daylight is 12 hours a day. If you’re beginning your tomato seedlings inside, a bright window or grow lights like these might provide the necessary light.

Try to plant your tomato seedlings in a bright area, even if you don’t have complete control over the amount of sunshine they get.As a side note, at least eight hours of that time spent in direct sunshine. There may not be enough light for the tomato plant leaves to develop correctly if all light diffuses.

Grow lights are an option if you’re having trouble getting enough tomato seedlings to germinate usually. It makes it much simpler to provide your tomato plant leaves with the amount of light they require.

Tomato seedling leaves become yellow when fertilized excessively.

tomato plants turning yellow

In most cases, tomato seedlings do not need extra fertilizer since they are small. As a result, overuse of fertilizer might harm the tomato plant leaves as it accumulates different nutrients. As a result, the tomato seedling will have growth issues and perhaps yellowing of the leaves.

If you see white clumps around the drainage holes, your potted plants may have too much fertilizer in the soil. To correct this, cease adding fertilizer and then cleanse the plant. Allow the surplus water to trickle out of the bottom after a heavy watering.

To test whether it makes a difference, repeat this process a few times over a period of many hours. However, you must ensure that the pot is well-draining to avoid using too much water. Your seedlings may be yellowing even when you haven’t applied any fertilizer.

Its okay to give the plant a little fertilizer in this situation, but don’t overdo it. Tomato seedlings may benefit from homemade compost, which improves soil nutrition levels while being gentle on the plants.

Tomato Seedlings That Have Yellow Leaves Can Be Transplanted.

When all else fails, transferring your tomato seedlings may be the solution. A seedling might benefit from a change of environment, even if it is only a few weeks old.

Whether your tomato seedlings remain developing inside, this may be precisely what they need to get some fresh air. New soil, sunshine, and fresh air may benefit tomato plant leaves.

It’s possible that new tomato seedlings may outgrow a container and need a bigger one or to plant in the ground. In my experience, transferring seedlings from starting pots to bigger containers or the garden sometimes provided yellowing tomato seedlings that push they needed to flourish.

To be safe, particularly with young seedlings, proceed with caution. It would be best if you first prepared them to face the elements. You may learn how to harden seedlings off in our article: Seedling Hardening (& Avoiding Transplant Shock).

Tomatillo seedlings are still vulnerable to damage, particularly to their root systems. It’s essential to handle them with care and avoid jarring their roots. Biodegradable containers like these are a fantastic option for growing tomato seedlings since they reduce the stress of transferring.

Whenever your pots become biodegradable, you don’t have to worry about disturbing the roots of such plants when you plant them.

Can you save a tomato plant with yellow leaves?

As you’ll see, there are indeed a variety of possible causes for yellowing tomato seedlings, and you may need to do some digging to discover the root of the problem. Once you’ve found the problem, you must be able to solve it and get your tomato plant leaves back on track for a healthy crop.


Tomato plant leaves need nitrogen to create strong stems and leaves. Without enough nitrogen, a tomato plant’s leaves turn yellow, resulting in restricted development and wilting stems. If you apply too much nitrogen, you risk burning your plants.

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