How to Save Tomato Plant Leaves with Yellow Spots

The leaf color of your household plants is often a good indicator of your plant’s health. For tomato plants, it can be a concerning sign to start seeing yellow spots appear on the leaves. Here are some reasons why you may see these yellow and brown spots and steps you can take to keep your tomato plant in healthy shape.

Issues with Watering

A lot of gardening problems that people encounter, especially with indoor gardening, is watering frequency. Yellow spots can appear on tomato plant leaves if you over-water or under-water the plant. In most cases, it’s the over-watering which is the issue. Soil that is over-saturated can prevent the tomato plant roots from getting enough oxygen for example. Over-watering problems are easy to identify. If you see the tiniest of puddles in your soil then you added too much water.

To save your tomato plant, we suggest you re-pot the plant if you think it’s going to take too long for the water to drain out from the soil. Moving forward, you should only water the tomato plant if the top inches of the soil start to feel dry.

Effects of Tomato Plant Fungus

Yellow spots can also appear on tomato plant leaves due to the presence of fungus like tomato early blight alternaria. This normally occurs during hot weather, especially when there has been a lot of rain and humidity. You will first notice the symptoms in the lower leaves. The effects will eventually migrate up the stem and create spots all over the tomato plant leaves. It’s important that you deal with this as soon as possible. Leaving it late will most likely kill the tomato plant.

Lack of Nutrients

Last but not least, yellow and brown spots on tomato leaves may also be caused by a lack of nutrient. Gardeners may forget to replenish the soil with the nutrients that plants require in order to grow and thrive. For tomato plants, yellow spots may occur due to issues like nitrogen deficiency. It could also be caused by a pH imbalance. We suggest grabbing a testing kit to first determine the conditions of the soil. You will then know what’s required to keep the soil in top condition.

One natural way of providing tomato plants sufficient nutrients is by adding a bit of used coffee ground to the soil. Tomato plants like coffee grounds because it contains a varying amount of nitrogen, phosphorus, and potassium.


  • Regina:

    Could the yellow blotches I am starting to see on the tomato leaves be due to magnesium deficiency??

  • Jane:

    Hey folks. Thought it be might be worth sharing my experience when dealing with yellow spots on tomato leaves but it ended up being due to a plant disease, specifically leaf mold. I found it helps when you don’t wet the leaves when the plant is being watered.

  • Sam:

    Make sure you prune any dead leaves! It will happen when your tomato plant starts to mature.

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