Why The Leaves Turning Black On My Azalea?

Azaleas add color and beauty to every home. They can break your heart when you discover your gorgeous plants turning to into black.

In order to revive your azalea, it is necessary to determine the root cause and decide in response to the findings. Continue reading to learn about the root cause and ways to address them.

Azaleas require specific conditions. If any of these conditions are not present or are incorrect your azalea’s plant will start to suffer. The most frequent causes for leaves turning black in azaleas are underwatering and over soil drainage, excessive fertilization, and over-fertilization.

This article will go over each one of them and the best methods to ensure that your azalea’s foliage is fresh and healthy. Let’s get into the specifics.

The causes of the azalea’s leaf turning into black

It is not uncommon to feel overwhelmed when your plant begins to appear sick However, every problem has simple solutions.

If you make sure that your plant is provided with everything it requires to stay healthy It will return to its gorgeous self within a matter of minutes.

Azalea pink flowers on bush


One of the most common errors with azaleas, or in fact, all indoor potted plants, is to leave the plant in stagnant or standing water for prolonged periods of time.

One of the primary reasons for this is having an unsuitable drainage pot. If the plant isn’t able to get sufficient drainage the soil and roots are prone to becoming sodden, resulting in the blackened leaves.

How to Fix Draining Issues

To let the roots drain, choose pots with draining holes. To increase drainage, put an inch-thick layer of gravel on the base of your pot. Azaleas like loamy soil to hold in the moisture.


One of the most common mistakes in caring of indoor plants can be in the wrong watering. Each plant has its own needs in regards to the amount of water they require.

Watering too frequently or too little water can harm plants. This is among the main reasons why Azalea leaves start to darken. Azaleas are a plant that can be temperamental.

How Much to Water

Azaleas like moist soil and they don’t like being in water that is stagnant for long time. To prevent this from happening it is essential to examine your azalea’s soil frequently.

If the soil is dry, it’s time to give it a good watering. If the soil is already damp then be patient until the soil has dried out just a bit. Don’t allow the soil to completely dry out.

How much water your plants needs will change all through the season. The plants will require less water in winter, colder seasons, and more during summer heat. If you’re not sure you should check your soil regularly.

Although you can add water to the pot, azaleas prefer being immersed regularly since it helps the soil take in more moisture.

Submerge the entire pot into the water in a large pot that is warm. The small bubbles will appear rising up to at the very top.

After the bubbles have stopped rising, take the plant out and let it drain until there is no more water down the sides.

It is essential to take out the pot when bubbles have stopped, as failing to remove it can result in the roots beginning to decay.

Using the Right Type of Water

Azaleas can be very sensitive to the kind of water you choose to use. They are averse to acidic conditions and are especially sensitive to hard water.

Hard water is a source of sodium bicarbonate, which is harmful to the Azalea. It is essential to determine the type of water you have in your area.

If the water is hard then use mineral or bottled water to provide water to your azalea. Azaleas thrive when they are watered by rainwater.

If it’s possible in your area, you can take advantage of rainwater collection and make use of it to provide water to your Azaleas.


It’s easy to think that all plants enjoy being fed frequently however, azaleas do not generally require a lot of fertilization and feeding.

Overfeeding can cause damage to the plant and could result in black leaves. The kind of fertilizer you choose is equally important in the case of Azaleas as the wrong fertilizer can harm the plant.

How to Apply Fertilizer

For proper fertilization Make sure to check your azalea’s daily to see if there is any new growth. Use fertilizer only when you notice new buds and leaves starting to develop.

Be sure to select a product designed specifically for plants that thrive in acidic conditions. Make sure to choose the food of your choice with a high content of iron and phosphorus, because this is the way to get the most effective results.

It is essential to reduce the amount listed in the label when you feed Azaleas. Do not apply fertilizer to your azalea more often than once every fortnight, since overdoing it can cause leaves to turn black.


Azaleas are very selective regarding their living conditions. They like temperatures that are between 50-60 degrees (10-15 degrees Celsius).

They thrive in direct, but bright light. The ideal spot for your azalea would be on your porch however, only during the summer months.

Windowsills are great spots for your azalea , but they must be handled with care. The heat and sun that are constant can dry your plants out.

How to Fix the Environmental Stress

If your house is prone to dry air, it’s essential to provide the plant with more humidity and moisture. There are a variety of methods to achieve this.

Another option is to purchase an air humidifier for your home. Since humidifiers can be costly and can be expensive, this isn’t an optimal solution.

There are ways to accomplish this no cost. One of the most effective ways is to put your azaleas in the bathroom when you’ve used the shower.

It is essential to ensure that your azalea is not left there as it could be damaged if it is exposed to heat temperatures over a prolonged period.

You can also increase the humidity by using a tiny spray bottle filled with ambient temperatures water, and then misting your plant frequently.

A small amount of pebbles that are damp under the pot is an efficient and inexpensive method to ensure that your azalea stays moist.

It is best to do this early in the morning so that the water has time to evaporate, and the plant isn’t swollen.

If you decide to put the plant in a window be sure to check often for sunlight exposed areas and soil that is dry.

The plant should be moved to a cooler place overnight since temperatures could drop dramatically this way, putting stress on the plant. Nearly any radiator is also a good idea to avoid.


Indoor plants are generally less afflicted from illnesses than plants that are grown outdoors. However, they could impact your indoor plant and are important to be aware of.

The most frequent are root rot, leaf-spot disease, as well as powdery mildew. The majority of these will not result in leaf rot.

If you notice marks on your leaves that are not there before, or something else that isn’t normal be sure to identify and address the issue.

One of the most effective and easiest ways to prevent diseases from attacking your azalea is to provide good maintenance of the pot. Make sure to check the pot frequently for dead flowers and leaves and remove them as soon as you notice.

Cylindrocladium Blight

One condition that causes the leaves to go dark is Cylindrocladium Blight. The disease causes leaves to change from brown to black and disappear in three to four days.

The disease may be affecting the stem as well as roots. The best method to combat this is to eliminate dead leaves, and then remove the affected areas.

Be sure to use equipment that has been sterilized to prevent spreading the infection. You can clean your tools at home by immersing your blade into boiling water.

Rhizoctonia Web Blight

The leaves of this disease begin to change in color, ranging between light brown and dark. Although the spots start small and are easy to overlook, they soon expand to cover the entire leaf.

If the leaf becomes affected, it will begin to end up dying and falling off. The best way to prevent this is to make sure that the plant is supplied with a fresh air supply and good ventilation.

The afternoon watering should also be avoided. If your plant becomes infected, you may also apply an chemical fungicide.


Indoor azaleas are afflicted by pests in a lesser degree than outdoor plants, however pests are still an issue. One of the most commonly encountered Indoor plants are spider mites.

Although they won’t result in the leaves to turn black, they can ruin your azalea prior to going on onto the next one.

The spider mites are at home in moist environments So ensuring that humidity remains crucial to reduce the chance of getting them.

Lace bugs

One insect that could make your azalea leaves look black is the azalea lacquer bug. The female will use the underside of the leaves to lay eggs.

As the eggs hatch and hatch, the bugs that hatch make use of their mouths and cut the leaves, taking out the chlorophyll. The lack of chlorophyll makes the leaves yellow.

The black dots are fecal matter that is that the bugs excrete. The best method to eliminate them is to examine the leaves frequently and take out eggs that hatch before they are removed. It is also possible to use insecticides to get rid of these insects.

Azaleas make a wonderful option for any interior plant collection. Their vibrant and intricate flowers can add beauty and color to any space.

But, it can become sad when their leaves start to turn dark brown or black. If you make sure that you provide your azalea the best possible conditions to avoid these dark, ominous black leaves that creep in.

Are you a homeowner with indoor Azaleas? What are your suggestions to ensure that the leaves are alive?



Went from a bad gardener to a half-decent one over 10+ years. Super happy to share my tips and tricks with you :)