Why Are My Basil Leaves Turning Black?

Basil is a cooking ingredient that many people love. Not only because of its delicious taste, but it is also an easy herb to grow. However, there are times when you also have to want to exclaim when you see the new green leaves that have now turned black spots.

Do not worry! In the following article, we will help you find out “Why are my basil leaves turning black and how to solve it?”

Why Are My Basil Leaves Turning Black?

This plant’s change in color can be due to the following reasons:


It is a herbaceous plant that is closely related to mint. They live and grow well in tropical climates. You can plant them anywhere, but don’t expose them to frost. Cold weather makes it susceptible to damage.

However, if you plant it where there is too much sunlight, it can also cause it to turn black due to sunburn. This is also a fairly common cause.

Pests And Insects Harmful

The species of insects that contribute to its changing color are beetles, spiders, aphids, etc. They also have an impressive name that is the leaf miner. Basil is a favorite food of these species.

After they eat, the green color will gradually turn gray, with tiny, burning spots, accompanied by dusty white patches left by their droppings.


Fluctuating weather or possibly disease-carrying insects can cause them to change color. But the most common is the condition caused by downy mildew. This disease usually occurs on wet and foggy days. When plants infected with this disease often turn yellow spots, turn black, and fall off quite quickly. If not treated in time, it can lead to tree death.

Not Being Provided With Adequate Nutrients

This case rarely happens. It lacks nutrients and often turns yellow and wrinkled. It can turn brown or black, leading to plant death.

So how to protect it from the above harmful causes. We will reveal it to you shortly.

Effective Ways To Preserve Basil Leaves

Some measures to help prevent this plant from color leaves change you can apply:

Cut the Dead Leaves Down

You can prune the dead leaves to avoid spreading. Besides, you can use temporary mulches to less damage the plants.

Remove Infection

Then, you need to remove the infected and spray with an organic bicarbonate-based fungicide solution. Infested leaves should be destroyed.

Spray Pesticides

You can use insecticides to get rid of them. Should choose medicines of organic origin to be safe for your health.

Provide Nutrients

You need to choose the fertilizers and water the plants regularly. The condition of the tree will improve rapidly.

What Are The Signs To Determine The Cause Of Leaves Turning Color?

Here are some signs that will help you detect tree damage:

  • When the weather turns cold, closely examine the color of the plant. If the weather turns colder and the tree starts to appear in small spots. The main reason is the weather.
  • In case there are small yellow spots on the leaf surface, which slowly turn brown, the leaf stem shows signs of rot. You can predict the cause of fungi and bacteria.
  • There are tiny black spots under the leaf surface, so it could be caused by insects.
  • If it is dull, yellow, and lifeless, it may be due to insufficient nutrients.


Why are my basil leaves turning black? This is often due to weather, insects, mold, bacteria, and lack of nutrients. After reading the article, we hope that it can help you take care of your home basil plant more easily.

Last Updated on April 25, 2022 by admin