Yellow Leaves On Tomato Plants - Check These 4 Signs

Have your tomato plant leaves been looking really sad and yellow lately? Yeah…it’s heartbreaking to see something you’ve planted degrade so easily, especially if you had some expectations from it. I mean…we all wish to make that tomato salsa with homegrown tomatoes, don’t we?

While the seasonal cycle of the plant definitely does play a role in the yellowing, the harsh truth is that some of it may also be your fault. 

Yellow Leaves On Tomato Plants

If the leaves of your tomato plant are yellowing, the first thing to evaluate is the pattern of the yellowing itself. And, yes, it does matter.

Some plants will begin yellowing at the stem which then spreads in the leaves whereas others will develop these strange yellow lines on the leaves that do not reach the stem.

So, what do these different patterns mean?

  • Yellowing only in the leaves or specific areas of the leaves often indicates a lack of nitrogen or magnesium. 
  • If the whole plant turns yellow quick (including the stem), it’s definitely a watering issue. You could either be overwatering or underwatering the plant. 

What do I mean by the pace and intensity of discoloration?

Well, it’s sort of like evaluating how quickly and badly your tomato leaves are yellowing. Knowing this can actually help you figure out the underlying issues with the plant. 

Yellow Leaves On Tomato Plants

As an example: If your tomato leaves are yellowing rather quickly and beginning to turn pale to some extent, you’re probably dealing with a nitrogen deficiency.

On the other hand, a stronger yellow (borderline brown) shade in the leaves may be an indication of disturbed and inconsistent watering. 

If yellowing in the tomato plant is accompanied by deforming textures or structural changes in the leaves, that too can give you a decent idea of the underlying issue you might be dealing with. 

  • Awkwardly wilted or flaccid leaves may suggest root suffocation or dehydration which is obviously a result of watering too much or too little for prolonged periods of time. 
  • Leaves turning crunchy and crisp from certain angles while remaining soft from others can be a sign of fungal infection in your tomato plant. 

While the other signs can be a little subtle and difficult to recognize, this one is perhaps the most obvious. 

Yellow Leaves On Tomato Plants

If fruit growth in your tomato plant is stunted and the leaves are starting to appear yellowish in some areas, immediate action must be taken!

Disease, pest infestation, and lack of important nutrients can all be potential contributors in this case

I usually use a very simple “magic” mixture that my mother taught me that usually works, the tomato plant leaves (and not only that, it also works with orchid plants, cucumber plants, etc) usually become green again, beautiful and healthy in just a few days.

You will only need:

  • 5 liter of water
  • 1 liter of milk
  • 1 tablespoon of soap

In 5 liters of water I add 1 liter of milk and 1 tablespoon of soap (used for washing dishes). I apply the mixture to the leaves with a sprayer two days in a row, just once a day, and wait.

In about 5 to 10 days, the leaves turn green again (the soap serves to “fix” the mixture to the leaves, it will not harm them).

YouTube video

Well, now that you know what signs to look for in a yellowing tomato plant, finding a potential solution has suddenly become much easier for you.

The appearance, fullness, fruit production, and pattern of yellowing in a plant can enlighten you about underlying problems if you just know what factors to evaluate. 

Yellow Leaves On Tomato Plants - Check These 4 Signs (+ Solution)

Good luck trying to bring your yellowing tomato plant back to life! 

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