Top 8 reasons why tomato plants are turning brown – How to fix them?


If tomatoes get too much water, get too much sun, get too much fertilizer, or are immersed, the ends of their leaves may turn brown. Once the problem has been found and fixed, the tomato plants can continue to grow new green leaves at their growing tips. You can get rid of tomato plants that are turning brown by cutting them back to the root.

This article will talk about the main reasons why the edges of tomato plants are turning brown and how to fix them.

8 reasons why tomato plants are turning brown

The gardener asks the leaves on my tomato plants are turning brown what should I do? Here are the main reasons why tomato plants are turning brown and how to fix each one.

1. Old leaves

The leaves of tomato plants are old and turns brown.

The ends of older tomato plants are turning brown first, and then the whole leaf turns brown. This will start near the root of the stem. This is a normal process that will not hurt the plant. You can cut these leaves off or trim them back with sharp shears.

When cutting them close to the main stem, be careful not to hurt them. This could be a way for diseases or pests to get in.

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2. Attack by bugs

Tomato plants are turning brown and yellow with spots on them. bugs can hurt tomato plants, especially when they are just starting to grow. 

They can make holes and leave brown and yellow sides. Aphids and spider mites are two common pests that can drain the sap from the leaves. When it gets warmer, they can make a lot of babies very quickly.

Neem oil can be spread on the leaves to get rid of bugs that eat the plant’s sap. The plant and the helpful animals will not be hurt. Before the bugs are gone, this can be done up to three times.

bugs that eat by chewing, like slugs, snails, and worms, can make holes in tomato plants that are turning brown.

3. Excessive fertilizers

overfertilizing cause brown leaves to plants.

If too much fertilizer is given to tomatoes, the edges of their leaves may turn brown. In the spring, the plants will grow quickly, but if they get too much nitrogen, potassium, or phosphorus, the leaves can get hurt by something called “fertilizer burn.”

Use a fertilizer made just for tomatoes or an organic slow-release fertilizer to keep the leaves from getting burned by the fertilizer or getting hurt. Add old cow dung and compost to the dirt before you plant. Four weeks after planting, you should sprinkle the area with pelleted chicken dung.

At the end of spring, add a fertilizer that helps plants make more flowers and food. This will make the amount of potassium to nitrogen better, which will help the plant bloom.

4. Frost’s injury

frost cause leaves to turn brown

When frost hurts tomato leaves, the edges may turn brown. Because the cold hurts the cell walls and makes them burst, the leaf may fall off totally.

Plant your young plants after the last spring frost because they are more likely to get hurt by the cold. You can keep them safe when they are young by putting a plastic drink bottle over them at night and in the morning.

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5. Sunburn to leaves 

sunburn also cause brown leaves

When it is very hot and sunny, the ends of tomato leaves can turn brown. If the tomato dries out too much, the leaves may droop and eventually turn yellow and brown.

Sunburn won’t hurt the plant if it has enough water at the end of the day. You can take off these broken leaves to clean up the plant, or you can leave them on until the sun and frost have gone away.

6. Water with chlorine or salt

If “hard” cleaned water is used to water tomatoes, the edges of the leaves may turn brown. Some sources of water can be very salty, full of chlorine, or have other chemicals that can build up in plants over time.

If the water in your town is very salty, use rainwater. Fill a jar with tap water and leave it outside for 24 hours to get rid of any extra chlorine. A lot of the chlorine will break down and evaporate over time, lowering the amount of chlorine in the water.

7. Not enough sunshine

If there isn’t enough sun, the ends of tomato leaves can turn brown. They can get long roots that make it hard for them to make food from sunlight.

Tomatoes should be grown in places that get a lot of early suns. If you live in a hot, dry place, protect them from the afternoon sun so they don’t get burned. Try to get at least 6 to 8 hours of sun every day. Doing this will lead to more green leaves and tasty, sweet tomatoes.

8. Overwatering

too much watering cause brown leaves to tomato plants.

If you water too much, the edges of tomato leaves can turn brown. Nitrogen can be washed out of the earth if it is watered too much, which makes the leaves turn first yellow and then brown.

If there is too much water, the roots of the tomato might rot. Fungi can hurt the tips of the roots and stop the plant from getting the water and nutrients it needs. Stop tomatoes from getting too much water by using a dripper.

In the summer, the best times to give them water are first thing in the morning or later in the day when the temperature has gone down. Tomatoes should only have their roots well wet; the leaves should not be watered.

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Tips on how to fix tomato plants that are turning brown

cut the part of leaves that turn brown.

Gardener wants some tips on the leaves of tomato plants that are turning brown. What to do if the edges of the leaves on your tomato plant are brown? If the edges of the leaves on your tomato plant have gone brown, here are some quick ways to fix them.

1. Use scissors to cut off the leaves that have turned brown.

Use clean, sharp secateurs to cut off any old leaves that have started to turn brown. If you take off the old leaves, more sunshine will be able to reach the new leaves, which will help the plant get better quickly.

2. Put raw mulch over plants

Put mulch all around your tomato plant to help keep water in and stop heavy rains from washing the soil away from the roots. 

You can use boxes, a paper that has been torn up, hay, or straw. Worms and soil bacteria will be able to eat these light mulches because they break down quickly.  

3. Give tomatoes water often.

A great way to keep the leaves of tomatoes healthy and green is to water them often, especially in the summer. Make sure to give them a lot of water so that their roots stay moist in the heat. Getting enough water will help keep the fruit from falling apart and will lead to bigger tomatoes.

4. Use light manure that breaks down quickly.

In the spring, use soft organic soil to feed your tomato plants. At the end of spring, do it again. If you don’t have flowers by the beginning of summer, use a fertilizer that makes fruit grow instead.

The edges of tomato plants are turning brown if they get too much water, fertilizer, or sunburn. Remove the old, brown leaves near the bottom of the stem to clean up the plant and keep the leaves from falling to the ground.


Tomato plants that are turning brown can be a problem whether you’ve grown tomatoes before or are just starting out. Even though many diseases and bugs can have terrible effects, they are all easy to get rid of. If you follow the tips above about how to water, cover, and keep your yard clean, you won’t have any problems with your tomatoes all season.

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