The Causes & Cures of Yellow Leaves on Tomato Plants - Dengarden - Home and Garden
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The Causes & Cures of Yellow Leaves on Tomato Plants

From his early days, Brandon helped his grandmother in her garden. He has always been passionate about tomatoes.

Yellow leaves on tomato plants

Yellow leaves on tomato plants

There are plenty of reasons for the tomato leaves to turn yellow. Sometimes, it is natural and not a cause of worry, but all the other times, you need to pay attention. Yellowing leaves on tomato plants could indicate something as simple as too much water or something serious, for instance, a pest attack which could turn ugly.

Some of the factors that can turn your tomato leaves yellow include:

  1. Under or over-watering.
  2. Nutrient deficiencies.
  3. Pests or possible diseases transmitted through these pests.

Some of these are easy to fix while the rest could be a tad bit tricky to diagnose and treat. In some extreme cases, there is no saving the plant and you're going to have to get rid of it to prevent the problem from spreading across your garden.

If it's your first time growing tomatoes or if you've had problems in the past and issues such as the yellowing of the leaves are not a rare occurrence, I would highly recommend that you read my article on growing tomatoes from seed. This guide also works for you if you buy saplings as it covers the different stages of growth.

Through this article, we're going to be diagnosing the cause of one symptom, but the guide above would help you sort out your plants so that you would not be in the same situation with yet another problem further down the road, blossom end rot during fruiting season, for instance.

Why Do Tomato Leaves Turn Yellow?

CauseSolution

Excess or deficient water

Learn how to gauge how much water your plant needs (see below).

Compacted soil

Work to aerate the soil.

Virus, fungus, or bacteria

Read on for a complete list of solutions.

Pests

Below, you'll find the signs of and solutions for an infestation.

Nutrient deficiencies

It could be an imbalance of nitrogen, minerals, alkalinity, etc.... see below for diagnoses and solutions.

Lack of sun

If you can move the plant to get more sun, then do; if most of the plant is unaffected, don't worry about it.

A normal stage of the growth cycle.

Don't worry about it!

Looking at this picture my first guess would be that this plant is suffering from a Magnesium deficiency.

Looking at this picture my first guess would be that this plant is suffering from a Magnesium deficiency.

What Makes Tomato Plant Leaves Turn Yellow?

1. Over Watering and Fusarium Root Rot

Tomato plants need perfect soil moisture levels. The soil shouldn’t be too wet nor too dry and it is important that the soil is dried out, but not too much before you water again. Determine how much water is needed by taking your weather conditions, the soil type, and the level of mulch you use into account. In some places, you'll need to water multiple times a day, but in others, watering just a few times a week is fine.

Read my guide on watering tomatoes for best techniques and precise quantities (for most gardens) needed for tomato plants which is applicable to most vegetables too.

Root Rot is one of the possible outcomes if you over-water potted tomato plants or if your garden has soil that does not drain well. When the roots of the plant are flooded for extended durations they cannot breathe anymore. This lack of oxygen causes the plant tissue to die and eventually decay. The decayed sections of the root spread and in time results in the death of the plant. In addition to this, there is also the root rot fungus that can be dormant in the soil but is activated by just one instance of overwatering.

Is Your Plant Suffering from Root Rot?

Root rot is one of the problems that are usually observed too late and the plant in most cases cannot be saved. You can be sure that root rot is your culprit if you notice the following:

  • The bottom leaves of the tomato plant have turned yellow indicating fusarium root rot.
  • The stem just above the ground is brown, but not a mature brown (like wood) that may even go higher up the plant, instead it is a brown that is not firm and is very often mushy.
  • If you notice a browning of the stem, you may want to slowly dig around the stem to see an inch or two below the soil. Do this carefully as you do not want to damage the plant (yet). Are you noticing this section is all wet and wrinkled like stale vegetables in the fridge? If yes, that's a clear sign of root rot.

I, fortunately, do not have any pictures to add, but I recommend you look here (a page from Cornell University) to see what this problem could seem like or better still, this image.

Dealing with Root Rot

Unfortunately, your plant cannot be saved and it's going to die, eventually, unless you spotted the problem very early.

The culprit is the root rot fungus if you know for sure that your plant has never been consecutively over watered and that there was never heavy rainfall that resulted in stranded water around the plant.

The fungus is usually dormant and can live in the soil for a few years. As described earlier, it can be activated by just a single session of overwatering. On the contrary, natural root rot will not happen if your tomato plants are flooded just once for a few hours.

In cases where you are not sure of the cause or if you know for a fact that it was caused by the fungus, you're going to have to throw away the plant. Do not put it in a compost pile. Also, throw away all the soil from the container or dig up a decent amount of soil from your garden (where the plant stood) and throw it away. It would be wise to not use that part of your garden for a year or two or look into local root rot resistant varieties. Also, clean up the tools you've used to dig up the plant, as the fungus can spread through your tools to the other parts of your garden.

Saving a Plant from Root Rot

If you're growing your tomatoes in containers and if you happened to come here after noticing the yellowing of the bottom leaves, but none of the other problems described in this article seem to be the issue, you could have potentially caught root rot at the early stages where the roots have been damaged and are incapable of delivering the demanded amount of nutrients, thus causing the yellowing of the leaves. I suggest that you continue reading on and go through the entire article before you pull up your plant to investigate

Also, for it to be root rot, you would have to have over-watered your plants at least once or you would have to be using soil that was not sterile, to begin with. If these are not conditions you could check off a list, the problem is something else entirely and it is very possible that I have not covered the issue, but it isn't root rot.

Once root rot is confirmed it's best to dig up the plant along with some soil so that the roots are intact and then wash the roots under gentle cold running water to get rid of all the soil. You may notice some of the decayed sections of the root fall off.

After carefully washing, use a shear to chop off any mushy black sections of the roots before washing again. Next place the roots in a gentle fungicide to kill the fungus causing the problem. It's best not to place the plant back into the same soil. Throw away the soil and wash the pot with bleach before adding new soil along with some compost/fertilizer.

I would also suggest that you chop off some leaves and branches to allow the plant to focus on growing roots rather than sending all the nutrients collected by the reduced root coverage up to the foliage.

2. Non-Aerated Soil

Non-Aerated soil or compact soil could be an issue. The first time I planted tomato plants, I placed tomato seeds in my garden and covered them up with a little soil. I did not loosen the soil underneath and had assumed it would be good enough considering that weeds and other plants grew pretty well. However, by the time the plants were a foot tall, the leaves began to turn yellow. After doing some initial research, way before I began writing this or any of my other tomato guides I learned that compacted soil could be the issue.

Everything clicked, that was definitely a thing in my garden and compact soil is not the best medium for root propagation thus limiting the amount of nutrients the plants could reach which resulted in the supply being less than the demand and hence the yellow leaves which were a sign of nutrient deficiency.

So, if you've got compact soil, dig it up a bit being careful not to damage the roots close to the base of the plant. You may see a recovery just by doing this and nothing more.

3. Septoria Leaf Spot

Caused by the fungus Septoria lycopersici, it attacks the foliage with a vengeance. It is a very common problem and tends to portray itself in areas that have extended wet periods or generally humid weather. The only good thing here is the fact that it's easy to distinguish this occurrence of yellowing leaves.

It's a fungus that is not soil based. It can survive winters by just being on weeds or other members of the nightshade family, such as peppers. If you've had an outbreak, there's a good possibility that some of your gardening equipment would be carrying the spores of the fungi, too. High humidity and warm temperatures bring them out of dormancy.

Septoria leaf rot looks like gray or brown spots surrounded by areas of yellow.

Septoria leaf rot looks like gray or brown spots surrounded by areas of yellow.

Detecting Septoria Leaf Spot

  • They are circular spots, anywhere between a 16th to a quarter of an inch in diameter.
  • The margins of the circular spots are dark brown, with lighter brown centers that may seem to be grey due to the color contrast.
  • Spots even though individually distinguishable may be joined by yellowish regions.
  • They typically spread upwards with the lower leaves being the first to be infected.
  • In extreme cases, the leaves can even wither and die after the number of spots on a certain leaf increases.

Dealing with Septoria Leaf Spot

There are many ways to deal with Septoria leaf spots if the spots and yellowing of the leaves is detected early. These aren't options, but a list of things you need to do:

  1. Get rid of any diseased leaves and throw it away with your kitchen waste or better yet, burn the leaves that are infected and while at it, pick some of the leaves immediately above the damaged leaves, just in case some of the spores have already made their way up.
  2. Mulch helps prevent a splash of soil when you water or from raindrops. Very often the fungus resides on the surface and only gets to the plant through droplets that splash around. There are plenty of other benefits to mulching, as well. There's no excuse not to have some.
  3. Water on the ground and not from the top to be on the safer side, even if you've got mulch.
  4. The nightshade family are perfect hosts, so you'd want to get rid of any nightshade weeds in your garden.
  5. Do not let your plants leaves touch the ground, try stakes or cages. It also helps if you spread your tomato plants so that such infections do not spread easily.

The image above is of an extreme case of Septoria leaf spot, take a look at this image if you want to see what a milder attack may look like.

4. Fusarium Wilt

This is a problem found across the globe and is caused by the soil borne pathogen Fusarium oxysporum. The fungus infects the plant through the root system and hampers the ability of the plant to absorb water resulting in the plant wilting, but only rarely dying.

Unlike many of the other issues that lead to yellow tomato leaves, this is one of the few where if left untreated the plant does not necessarily die and therefore gardeners keep trying to revive the plant without knowing the actual cause of the problem. It is therefore important that you are able to identify Fusarium Wilt when you see it.

Identifying Fusarium Wilt

  • It begins with the lower leaves turning yellow and dropping with the problem climbing up the plant as the days go by.
  • The plant will continue to seem wilted even though there is sufficient water in the soil.
  • After prolonged periods, some leaves will begin to fall off.
Fusarium Wilt causes leaves to wilt, turn yellow and drop.

Fusarium Wilt causes leaves to wilt, turn yellow and drop.

Preventing Fusarium Wilt

Maintain soil at a pH of around 6.5, this ideal pH for tomato plants helps limit the fungus from setting root and taking over. If this is a problem that you've been seeing happen over and over again, you should look into varieties that are more resistant to this fungus. To the best of my knowledge, there are none that are completely immune.

The fungus can only enter a plant through damaged roots, therefore it is important that you prevent even small amount of root rot (first point in this list) and also be careful when digging up soil around the plant.

If you've got a plant that has already been attacked by this fungus, it's a futile attempt trying to save it. You'd just be putting all your time and effort into trying to revive it when in reality it won't really recover. The best thing to do is uproot the plant and burn it or dump it along with your waste, but not into a compost pit.

Early blight, a fungus called Alternaria solani, appears on the lowest, oldest leaves first. It looks like little brown spots with concentric rings that form a “bull’s eye." Eventually, the leaf turns yellow, withers, and dies. Treat as you would Septoria leaf spot.
Bacterial wilt, aka Ralstonia solanacearum, is a soil-borne bacterium common in moist, humid, sandy soils. It moves quickly up from the roots to the stem. Remove and burn the affected plant so the bacteria doesn't spread.
Verticillium wilt from Verticilliurn alboatrum, a soil-borne fungus that lives in many cool Northeast gardens. It starts as yellow patches on the low leaves and progresses to brown spots and curled, dead leaves. The best way to make sure that the plant is affected by Verticillium wilt is to chop off the branch that shows these symptoms and look for dark coloured rings. Unfortunately, the plant can't be saved, but the soil can be treated to prevent problems in the future.

This is probably the first stage of Verticillium wilt. The soil is infected with a fungus. The plant can't be saved and the soil should be treated.

This is probably the first stage of Verticillium wilt. The soil is infected with a fungus. The plant can't be saved and the soil should be treated.

  • Pests. Pests can be controlled using predators or other natural methods. Pests are not always obvious—you may need to look closely at the stem or turn over the leaves and search to find them. I've seen white insects (mealybugs) and aphids. Soapy spray gets rid of mealybugs and ladybugs feast on aphids. You may want to search for natural ways to get rid of mealybugs if you're going the organic route.
  • Nutrient Deficiencies. Macro and micro-nutrient deficiencies are a leading cause of yellow leaves in all plants, not just tomatoes. It does not necessarily mean that your soil is lacking—there are instances where the plant is simply incapable of absorbing nutrients. See below for more information.

Yellow Tomato Leaves Sometimes Indicate Nutrition Deficiency

  • Absorption Difficulty (or Under-Watering): Tomato plants can absorb nutrients only through their roots. If this is prevented for any reason, then they are going to lack key nutrients. Water is the medium through which they absorb nutrients from the soil. Therefore, you need to ensure they get sufficient water, but not too much (see the point about excess moisture above).
  • Imbalanced Alkalinity: Is your soil pH acidic or alkaline? Tomato plants need the right pH range for successful absorption of nutrients. You’ll need to add a little fertilizer, but don’t over-fertilize, which leads to high pH. I would recommend you read my guide on fertilizing tomatoes to know how to do it right based on the stage of growth.
  • Lack of Nitrogen: When there's a deficiency of nitrogen, the older leaves at the bottom usually turn yellow whereas the upper, new leaves remain bright green as though there’s no problem at all. However, you’ll notice that the overall growth rate drops and your tomato plants will be shunted. You could add urea or ammonium to the soil or any other form of manure.
These yellow streaks on a tomato indicate low nitrogen in the soil.

These yellow streaks on a tomato indicate low nitrogen in the soil.

  • Deficiency of Potassium: Here, the leaf as a whole doesn’t turn yellow, but the area between veins turns yellowish and the leaves may wilt. You could add potash to your soil.
  • Calcium Deficiency: The growing tips of the plant may turn yellow and die within a few days. This is known as blossom end rot. Adding any compound containing calcium will work wonders.
  • Lack of Magnesium: This will result in stunted growth and the outer edges of the leaves may become pale and yellow. Here the leaves seem to have a golden border. Another way this deficiency is exhibited is via small yellow spots that emerge on the green portions of the leaves (around the veins), these sections grow and merge leaving green veins with the rest of the leaf yellow. Eventually, the entire leaf would go yellow and wilt. Epsom salts are a good source of magnesium.
A sample of a leaf affected by a deficit in Magnesium. The veins are still green while the rest of the leaf turns yellow.

A sample of a leaf affected by a deficit in Magnesium. The veins are still green while the rest of the leaf turns yellow.


  • Sulphur Deficiency: Do the new leaves look yellow but the older foliage remains fresh and green? Does the plant suffers from stunted growth? Add sulphur.
  • Zinc Deficiency: Lack of zinc leads to the area between veins turning yellow, especially in the new leaves. This often leads to a bunch of small leaves at the top (a rosette).

All of these issues can easily be prevented if you amend the soil.

Yellow Leaves on Tomato Plants – Not Always a Cause of Worry

If you observe any plant, eventually you'll see the older leaves wilt and die. Similarly, your tomato plant will also have yellow leaves at the bottom. This is a normal stage of the growth cycle. Also it could indicate a lack of sunshine due to shading by the higher leaves. As long as the plant continues to grow healthily and produce fruits, you need not worry.

Diagnosing Tomato Leaf Problems

Why are there brown, gray, and yellow spots on my tomato plant's leaves?

This could indicate Septoria leaf spot, a soil-borne fungus that affects the leaves but not the fruit. It's a common issue with tomatoes, especially in wet, humid areas. It usually starts at the bottom of the plant with the oldest leaves and moves up. You might see darker spots surrounded by pale yellow areas that may eventually turn completely yellow or brown and die. If you look further up this article you will see a picture which you can use to help identify the problem you are facing.

What if the whole tomato leaf turns pale yellow?

Are older leaves turning yellow? This may not necessarily be a problem. You could check out the list of points already covered earlier. But, if the new leaf fonds open up to be yellowish, it's most likely a nutrient deficiency. Fungal attacks usually affect the entire plant at a time or go from the bottom to the top.

Why are the leaves on my tomato plants turning brown?

Tomato plant leaves do not begin by turning brown unless it's a fungal attack such as Septoria leaf spot or other fungal infections. So, if you notice your leaves turning brown before they go yellow you should look for a solution as soon as possible. The helpful points above are definitely going to help you out.

Why are the leaves dying?

The death of leaves on a plant is quite natural and not a reason to worry. The lower leaves that no longer receive sun light usually wilt and die as they are useless to the plant since they are just consumers and not producers. As long as you see some healthy foliage at the top of the plant you don't have to think twice about it.

Learning From Other Gardeners Out There

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

Questions & Answers

Question: I just planted my tomatoes a week ago, and I have a yellow leaf on the bottom of one plant. What causes this?

Answer: A yellow leaf on the bottom of a new plant is almost always due to a lack of nitrogen in the soil. You do not need to add fertilizer, it would help, but you could try adding some compost as most compost is rich in nitrogen compounds that the plants can use up.

Question: Why are the leaves on the bottom of my tomato plant turning yellow and dying? The leaves further up are also turning yellow. My tomato plant is still growing and looks light green on the top of the plant.

Answer: From the way you describe it, it sounds like the normal growth of any plant. The older leaves dry up and fall off while the plant continues to grow. You have nothing to worry about.

Question: The bottom leaves of my cherry tomato plant are turning yellow-brown as well as the small leaves at the very top of the plant where it's starting to fruit. What is going on?

Answer: It's not necessary a mix of things. I would focus on trying to figure out the cause of the new leaves coming out yellow. It's quite natural for the bottom leaves of a plant to wither and die.

Question: Why are the leaves disappearing from the tomato plant branches? Why do the branches then look like pencils?

Answer: For a second I was wondering what you meant by looked like pencils. But, both issues together makes it clear that you have a caterpillar on your plant. You would want to find it and get rid of it. They are usually well camouflaged, and it may be hard to spot. The most common type of caterpillar on tomato plants is the hardwood caterpillar. You may want to look this up on Google.

Question: I have a current fungus issue in my lawn, can it cross contaminate my tomato plant?

Answer: There are so many factors to consider that it's really hard to diagnose a problem. But you say that the plant is still producing fruit, that's a good thing. The best conclusion I could reach is that the plant has realized that it is the end of the season (where you live?) and is, therefore, putting all it got into the production of fruit. Without more information and pictures, it's hard to say.

Have your say

Augustus on August 30, 2020:

Thanks for sharing your indepth information on how treat and care of tomatoes. I appreciate your search to help those of us starters.

Brandon Lobo (author) on August 02, 2020:

It happens under stress, usually cold temperatures. Some varieties, the older varieties tend to have a very distinct center which in their case is normal.

Mary Christine Capstick on August 01, 2020:

What causes the center of tomatoes to have a white, inedible center? How to control this?

Brandon Lobo (author) on July 31, 2020:

Hi Gary, so you've cut off all the leaves? In lower light conditions it is all the more important to leave the leaves on because the plant is going to need all the energy it can get for the development of fruit. You shouldn't be surprised if some fruit begins to develop and the rest of the flowers fall off, even though they are fertilized.

Gary on July 31, 2020:

My plants have grown to nearly 3ft. Have the flower stems with flowers. I've cut all the lower stems with leaves on and left the tops as I don't get much sun light. Is thi right. I'm feeding once a week and watching the suckers etc.

Brandon Lobo (author) on July 22, 2020:

Hi Saundra, I have a guide that talks about this https://dengarden.com/gardening/Tomato-Wilting-Dro...

Saundra Singh on July 22, 2020:

The lower leaves on my tomato plant are turning yellow along the edges, first, and then start wilting and dropping individual leaves on that particular branch. It's been rainy, wet and humid, lately. I cut these leaves off. They are all at the bottom. Also my fruit looks very small. What is this due to? It is an above ground garden and I think well drained. Not enough sunlight, I know, and humidity lately.

Brandon Lobo (author) on July 16, 2020:

If the leaves and diseased, it is better to remove them for two reasons, one the disease would spread and secondly the leaves will not be very productive and would just be leeching nutrients away from the rest of the plant.

If the leaves are yellow just because they are older and dying, you do not need to remove them.The plant has already stopped sending in nutrients and possibly is taking some back. I am not sure if tomatoes do this, but there are plants and trees that take back resources from dying leaves.

Ornella14 on July 16, 2020:

Hello! Should I remove the yellowish branches or just the leaves, or leave them? Thank you

Nancy Dellasala on June 27, 2020:

Thank you for your help on my first time ever tomato plant outside on my deck in a planter and I noticed that it has yellow leafs on the bottom of the plant, concerned I'm doing everything right for it's my first time. Thank you for your help.

A J on June 17, 2020:

Hi Branson,

Great advice so far.

Hoping you can help me with mine.

I was doing really well with my tomato plants, that were growing vigourously with a great healthy green colour (2feet tall) but i've noticed the last few days the green has a yellowishness to it (also, bottom leaves are yellow, though not freaking out about those as your comments assure me it's normal). They've got flowers but no beginnigs of fruit yet.

I feed weekly with a seaweed feed, and they are in a big pot with a reservoir at the bottom. We've had really hot weather (i'm in London), but the temperature dropped recently for a few days (though i always put a cover on them when it's cold).

I've now discovered my neighbour, thinking he's doing me a favour, has been watering my plants without my consent (bless, he's 82) and with a hose, which means they're now getting waterered from above and on the leaves. Plus, i cant gauge how much water they are now getting.

In addition, in the pot i also have a tumbling tomato plants that look wilted, but believe that's their character? This plant was never as bright green, has no yellow leaves and is now starting to grow toms. Confused!

Will a boost from an extra feed help?

Will the green return?

Do i reduce watering right down and rely on the resevoir / let the resevoir drain?

Hide my neighbour's hose?

Many thanks

Ali

Brandon Lobo (author) on June 14, 2020:

The way you describe it, it could potentially be wilt. Wilt does not necessarily mean the plant wilts. Check out this article of mine for more info, maybe it would help https://dengarden.com/gardening/Tomato-Wilting-Dro...

Magnolia on June 12, 2020:

Hello, I have several young tomatoe plants (a few months old, about 8 in. tall) that lately have startes to turn yellow. It began with the bottom leaves that started turning completely yellow, but now its more leaves. They don't seem to be growing very much either. It all started with them having gotten way too much water over a weekend when it stormed. Over the next few days there were several little mushrooms growing. We decided to let it dry out before watering again so that the mushrooms would die out. After a few days they did die out, but then we noticed that the lower leaves were becoming completely yellow. We thought maybe they were getting too much shade so we moved them to an area that gets more sun in the afternoons. After a few days we noticed that more leaves were turning yellow and thought maybe they weren't getting enough water (we water every other day), so we started watering every day now, but nothing seems to have changed. I don't see any bugs around the dirt, other than baby spiders. We aren't sure what else to do. A few days ago we watered them with some epsom salt, but I don't think it helped. This is the first time we grow tomate plants and are very new and need lots of help please!

Brandon Lobo (author) on June 07, 2020:

Could it be tomato wilt?

Gainesvillegator on June 05, 2020:

We have tomato plants that look healthy, however, some of the the top leaf sections have yellow leaves. We planted them 10-14 days ago after buying them from a nursery. Any ideas ? I’ve read through causes, however, I cannot find anything that looks or seems like the cause. Thank you

Brandon Lobo (author) on June 05, 2020:

@myrahu and emuttdog, both of you seem to be talking about tomato wilt. Please take a look at the new article I just wrote on the topic, it should help you guys out: https://dengarden.com/gardening/Tomato-Wilting-Dro...

emuttdog on June 04, 2020:

Tomato plant top and new leaves are turning pale yellow/lime green. Some branches look like they are limp. Any ideas??

myrahu on May 22, 2020:

About two months ago, I planted two Red Cherry Tomato plants in the ground and about three days ago, I noticed one of them has some branches that are wilting with curled leaves, but they aren't discolored. Then yesterday, some of the lower leaves turned yellow, but the veins are still green. The other Red Cherry is fine, as are the other 6 tomato plants I planted. They are on drip irrigation, but the plant may have gotten over-watered when it rained a bit more than we anticipated. At planting, I fertilized it with vegetable fertilizer according to the package directions.

We live in zone 9B in the Bay Area of CA. It hasn't gotten above 80 degrees F yet, but it's going to be 90 or above this weekend.

Any idea what could be causing this problem? I'm worried about it possibly spreading to my other tomato plants.

ChelBaney on May 21, 2020:

Having the same issues as Jim Rodgers, like the exact same issues. Planted Better Boy, Big Boy and Celebrity. Only issues with Better Boy. The entire plant is light yellow and looks sickly and has not grown much since planting a month ago.

Brandon Lobo (author) on May 19, 2020:

How are they yellowing, along the veins, the tips, the entire leaf?

Jim Rodgers on May 19, 2020:

Planted German Queen and Better Boy tomatk plants 3 weeks ago. Some of leaves in top of plants are turning light yellow.Any idea what is problem.I planted some Big Boy and Celebrity plants at same time and they are not yellowing.

Brandon Lobo (author) on May 17, 2020:

Doesn't look like it has worsened is good news. Good luck.

somaman on May 17, 2020:

Thanks again. That's relieving. I've been bottom watering with about 1-2 inches of water. The soil depth in their pots is about 8-10 inches and at the end of the day, most of the water has been absorbed/evaporated. Doesn't look like the situation worsened overnight.

Brandon Lobo (author) on May 16, 2020:

It's very likely that it was the sun if you did not change any other parameters. How is the water? Maybe the sun dried the container out?

somaman on May 16, 2020:

Hi, thanks for the useful site. I'm in Denver, and about to plant my tomatoes outside. I've been hardening them to the outdoors for about a week now but today was the first day I left them outside in the sun all day. As I brought them in, I notice many of the leaves have developed small areas of yellowing. Nothing really matches what I'm seeing on your page. Some of the yellow is on the outer most edges, some yellow spots are near the veins. No dark center and the newer leaves seem fine. Could I have exposed them to too much sun too soon? I just added some liquid fertilizer to see if that does the trick...

Brandon Lobo (author) on May 15, 2020:

I'm sorry to hear that, but I cannot really think of any reason other than the fertilizer causing this. Seedlings need half the amount of grown-up plants. Unless the package said 1/2 strength for tomato seedlings, it's twice what was needed.

Tiffany on May 14, 2020:

I have a bunch of tomato seedlings that all turned yellow almost overnight. I did maybe overwater or I did add a fish emulsion as the fertilizer (1/2 strength as what it called for). If it was overwatering would it change that fast? Or... Any idea If/what deficiency it could be? Some leaves look like the vein/ yellow and other are just full leaf pale yellow. Entire plant.

Thanks!!!!

Brandon Lobo (author) on May 13, 2020:

Hi Micki, this is a pretty common problem and can happen with large temperature fluctuations. As long as the leaves are not falling off or developing any kinds of weird spots and the stem looks good, you should be fine and the plant will recover. The other causes would be over or under watering, but you say that shouldn't be a problem in this case.

Micki Kuhlmann on May 12, 2020:

Hi Brandon, uniformly pale yellow leaves starting at bottom going to top of plant - now about 2/3 the way up. I suspect it is either the weather or the age of the plant. It is a Brandywine that I started last fall (I was saving seeds and they germinated so I planted them) - and planted out in a container on my deck a few weeks ago. The leaves had started turning yellow, but I wasn't concerned - normal thing, but now they are pretty high up. Shouldn't be fertilizer - and really not disease either. We did have an unexpected cold spell in low 40s at night with lots of wind for last 10 days. Any ideas? Thanks - Micki

DeeRexi on April 27, 2020:

My tomatoe plant has some pale yellow leaves but also has some concerning spots of brown spots on the edges of some of the leaves when you touch them they crumble as if it's dry there are not black or white freckle spots just dry brown brittle spots. I have 3 planter's in the window sill in my kitchen where the sun shines in the morning.

Brandon Lobo (author) on April 20, 2020:

Check out my article on transplanting tomatoes, look at the section on hardening tomato plants: https://dengarden.com/gardening/transplanting-toma... If you've already planted them into the ground, I would leave them there, they will recover soon enough.

But just to be safe, make sure that you do not over water. You may want to also check out this article on some best practices: https://dengarden.com/gardening/How-to-water-Tomat... in short, water only when the soil is dry an inch or two beneath the surface.

Good luck.

Amy on April 20, 2020:

Yes, we transplanted some from a greenhouse. Could it be too much sun? Should we cover them with a tarp or something? Thanks so much for your help!

Brandon Lobo (author) on April 20, 2020:

Hi Amy, you say you planted them three days ago, so I assume you bought saplings and transplanted them. The good news is that three days is too quick for leaves to turn yellow due to over watering issues or nutrients. I would guess it has something to do with the plants going from relative shade to intense sun conditions. Three days is also too quick for any disease to take effect provided the plants were healthy when you bought them. I would advise you to wait it out and your plants should recover from this shock and get used to the sun.

Amy on April 20, 2020:

We just planted our tomato plants three days ago and the leaves are already turning yellow and wilting. The yellow is on every plant of the 15 we planted. And not just a few leaves. Are we watering them too much? Are they missing a nutrient? Please help!

Brandon Lobo (author) on March 16, 2020:

Hi Sid, I do not live in the US and I'm not very familiar with the zones and what they mean. Is a higher number lower frost or greater frost times? Anyway, purplish leaves are a sign of phosphorous deficiency. This can happen due to the soil lacking this nutrient or cold conditions that are preventing the uptake.

Curly top virus that is spread by some bugs causes a purplish hue and yellowing on the leaves (hopefully this is not what your plants are infected with). The other possibility are mites of a sort that suck on sap from the new leaves, shaking the plant would create a dust and you'd notice them if this is the cause.

Sid Kemp from Boca Raton, Florida (near Miami and Palm Beach) on March 16, 2020:

We live in South Florida, Zone 9, and get a lot of sun. Leaves on the upper branches of our tomato plants are turning yellow or purple, then the leaf withers and dies. Is too much sun a possibility? If not, which of the items in your wonderful article seems most likely?

Thanks in advance.

VADIVELU Anbanaden on February 09, 2020:

Thanks for your valuable information!

Ella Craanen on August 23, 2019:

My tomatoes rut on the wine before ripenning. Ripe ones when picked rot within days.

Jim on May 07, 2019:

I have small new leaves coming out yellowish (a little white) at the top of three tomato plants in a row, I have a total of 7. It appears right along with the new flowers, any ideas? I have never seen anything like it. Thank You.

Brandon Lobo (author) on July 30, 2018:

Hey Todd, are the capsule-like things the first leaves? If you have just one or two yellow capsule-shaped leaves you have nothing to worry about. Also, it's the normal plant growth process for the lower leaves to become yellow, dry up and fall off. Your plants seem to be doing fine. Don't worry about it.

TOdd on July 29, 2018:

Hello. I have a potted tomato that was over waist height. Was doing fine but now the leaves are yellowing and dying from the bottom. Also, there are small little pale yellow capsule-shaped things on the bottom stem. Thanks for any advice. Enjoy August & the late summer - T

Random23 on July 09, 2018:

I am new to growing tomatoes I am going mine in pots though. One of my tomatoe plants stems is starting to turn brown I've checked the roots and they look fine. It did drop a lead I'm not sure why before the leaf died it looked perfect.

nholliman12@gmail.com on June 22, 2018:

I am a new to growing tomatoes. My plants are blooming but only 1 tomato produced. Can you please tell me my error.

Also, I am getting yellow leaves at the bottom.

Brandon Lobo (author) on May 25, 2018:

Wow. That's a lot of water. Good luck with your plants Barbara, thanks for writing.

Barbara Badder from USA on May 24, 2018:

Your hub has a really complete description of everything that could go wrong with tomato plants. My problem is as I guessed. We've had flooding rains for a couple of weeks now and when I tipped my pot over, I got at least a gallon or two of water to pour out. Thanks for the advice so I could double check.

Brandon Lobo (author) on September 05, 2017:

Hi Sudha, is this something (curling and drying of leaves) that has happened overnight? If yes, it could be root rot. It is natural for flowers to bloom and fall, the fruit follows. Make sure the plant is not indoors as you want the flowers to be pollinated. You may want to google methods to pollinate tomato plants manually.

Sudha on September 04, 2017:

Hi my tomato plants in pots have leaves which are green but curling up and dry. Also the flowers bloom and then dry and fall:-(

Brandon Lobo (author) on July 08, 2017:

It's always wise to switch plants around. Switch between each crop I'd say.

Brutus Maximus on July 06, 2017:

I have potted tomato plants & cucumbers. Should the pots be rotated or is that detrimental ?

Laura on August 06, 2016:

You do best by adding epson in watering .

Brandon Lobo (author) on July 13, 2014:

Hi Sharon, I've never tried epson salts as I use organic compost made at home itself. Why don't you try it out (in a smaller amount) on 2 - 3 tomato plants and check out the progress in their growth

Sharon on July 08, 2014:

Epson salt, too much,killed most of the new tomato plants. Hubby put 2heaping tablespoons per plant when planting! Had to re-plant nearly all the plants as they just died. Do not recommend epson salts???

Brandon Lobo (author) on May 15, 2012:

Too much sun won't be the cause of yellow tomato leaves. However, the white flies could potentially be a cause. Are your plants receiving enough water? Do you add fertilizers? I've written articles about these steps too. You'd find links to them on this article itself.

Yes, your tomato plant stands a chance; but, the chances are slim; make sure to take care of it until it recovers and gets new leaves. If you think the sun is an issue try using a sort of shelter over the plant - at least till it recovers.

help me on May 15, 2012:

My tomato plants turned all yellow I think because of too much sun and white flies. I trimmed all the leaves off, so will the plant survive? I have one that all it has on it now are two tomatoes, no leaves. Will the leaves grow back or is this plant a looser?

Brandon Lobo (author) on February 18, 2012:

Thanks Madurai for adding this info to the hub. Yes, Nitrogen could be just one of the many causes and you'd need to check all possibilities when determining the cause because, you wouldn't know if the yellow leaves were caused due to an infection or pest.

Madurai from Online on February 18, 2012:

usually a plant turns yellow due to a lack of nitrogen in the soil. You have provided here great info about the symptoms of yellow leaves. Thanks for sharing..

WD Curry 111 from Space Coast on November 03, 2011:

Can you hear me clapping my hands and jumping up and down?

Here is a proverb that applies to you. "Do you see a man who is skilled and diligent in his work? He will stand before kings, and not before obscure men." Go get em' Tiger.

WD Curry 111 from Space Coast on November 03, 2011:

I'll be looking forward to reading more of your work and applauding your success.

Brandon Lobo (author) on November 03, 2011:

Hi WD Curry thanks for the great comment. Nice and motivating :)

Great that you found my style of writing pleasant and useful. I'm just 18 and looking forward to writing lots and lots here on hub pages.

WD Curry 111 from Space Coast on November 03, 2011:

I checked funny, too. I laughed at my ignorance. I was surprised that people garden tomatoes in India. I should have known from all of the wonderful sauces in your sophisticated menu. If you want to flirt with disaster, grow tomatoes in this part of Florida (nematodes). Sometimes we actually get a crop. It is usually the fall planting that rewards you, but we try in spring anyway. This will surely help.

You are very professional in your presentation and practical application of opportunities. There is hope for the future with young men like you leading the way.

Brandon Lobo (author) on October 31, 2011:

Yes the same tips apply to others as well. I don't know about the extra water but the nutrient deficiencies etc. applies to all plants.

Stephanie Das from Miami, US on October 31, 2011:

Do you think that these tips apply to a lot of other plants, too? I had problems with my basil turning yellow this summer.