Kumquat Leaves Turning Yellow: Causes & Fixes

Kumquat is a very interesting name and it is a quite interesting tree that comes from the family Rutaceae. It is a tree that can bring small fruits of kumquat which are pretty similar to oranges but yet they are a little bit different.

This tree is native to south-eastern China, and it cannot be grown everywhere, even if they do, there are signs that it shows the way that it feels. As a sign of not feeling good stand the leaves of the kumquat turn yellow, and it is one of the most common issues that kumquat tree owners have to deal with.

A good thing to know is that there is some kind of reasons that may cause leaves to turn yellow, and you will find out about all of them in this article! I will be mentioning some of the most important reasons, along with some other information that is good to be known!

Now, without further ado, let’s get this article started!

Why Are My Kumquat’s Leaves Turning Yellow?

The main topic and the main thing that you need to know about kumquat leaves turning yellow is the reasons why it happens!

Kumquat is a plant that requires different things, and when they are not properly given, the plant gets sick, and every ill thing has its symptoms, which in this case are the yellow leaves. The yellow leaves in kumquat appear because of a lack of nutrients, water, temperature, humidity, and root rot.

Let us get into more detail about the causes!

Lack of Nutrients

Considering the fact that kumquat is a tree that gives us fruits, nutrients, or the food that you give to it is one of the most important things. If there are not enough nutrients the tree won’t be able to produce any fruit, and if you notice that small yellow spots are shown on the leaves, you can expect this to happen.

What should you do?
Fulfilling the need for nutrients isn’t the easiest thing to do, but the good thing about this tree is that it tells us what it needs. The most needed nutrient in a kumquat tree is nitrogen and it comes in the form of nitrate and ammonium. If you put the nutrients into the soil, next to the roots of the tree, you will notice that the yellow leaves won’t appear.

Watering Problems

Whenever I mention watering problems, you should have in mind the two most annoying things that water brings and they are underwatering and overwatering. While watering a kumquat plant, you should be very careful, especially with overwatering as it is one of the main things that cause leaves turning yellow.

What should you do?
Dealing with improper watering techniques or schedules, the best thing is to have in mind that there is the proper way of watering. While watering a kumquat tree, it is better if you water it two to three times a week, until the fruits are ready. If you notice that there appear underwatering problems, you can rise up the times per week.


As the temperature is mentioned, you should definitely know that a kumquat tree is one of the most tolerant plants when it comes to cold weather, f course when it is compared to other fruit-giving trees. However, there are different requirements as it cannot really stand hot weather.

What should you do?
Well, in order to grow a normal kumquat tree without yellow leaves, you should know that the appropriate temperature for a kumquat stands between 55 – 85 °F (12 – 29 °C).


Just like the temperature, there’s another thing that can cause yellow leaves on a kumquat tree and it is no other than humidity. The air dryness is literally hated by these plants, but in this case, I am talking only if you grow them indoors. The leaves can quickly turn yellow if you don’t have the humidity controlled.

What should you do?
The best humidity percentage for a kumquat tree stands between 40, 50, and 60%, and if you go under, you can expect more than just yellow spots on leaves, they can turn brown as well.

Root Rot

Root rot is one of the worst conditions that any type of plant can get into. Whenever a plant has a rotten root, you can expect full death of the plant, unless you have in mind that yellow leaves can be caused by it! Always remember, when a kumquat has yellow leaves it may be because of its roots, and if you prevent faster, everything goes as it should.

What should you do?
In order to deal with root rot, the best thing to do is to change the pot and the soil in which you have the tree planted. That’s because root rot can happen because of not appropriate soil, and changing and finding the best one is an essential thing to do. Have in mind that the soil shouldn’t be dense.

Final Words

Here we came at the end of this article, in which I tried to tell you in very simple form the reasons why your kumquat’s leaves are turning yellow, as well as the things that you can do in order to deal with them! It is important to know everything that this tree requires from you so that you can give it in the best way possible.

Anyways, I really hope that this article will be your biggest helper and supporter if you are dealing with kumquat leaves turning yellow!

Further Reading

I cannot leave this article without mentioning to you some other things that I have already written, and the main one that I would like to include stands the reason why hibiscus leaves turn yellow!

Another important issue that many plant owners deal with is the brown colorization of the leaves of any plant that they might grow. In this case, if you own an areca palm plant, you can find out what is the brown color of the leaves of the areca palm. Also, there is the aloe vera should be mentioned as well, and you might want to know that there are some things that cause brown coloration on the aloe vera plant.

A final article that I would like to introduce to you is the anthurium leaves turning brown, as they can do that super-quickly!

Have fun!

Ella Holmes

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