Why Dahlias Not Blooming

It is very disappointing to see that dahlias are not blooming. We plant dahlias only for their flowers, don’t we? And if these are not blooming then it is natural to be disappointed. There can be many reasons for dahlias not blooming and there are solutions for them. We are going to talk about these causes and consequences here.

But, before we dive into the topic, let us know what are the ideal conditions for a dahlia in which it performs well and gives abundant flowering.

Back to Main Article   Go back to learn About Dahlia In Detail.

The Ideal Conditions For A Dahlia In Which It Performs Well


Whether you plant them in containers indoors or outdoors in the garden, you have to make sure that

  • The soil is at least 60 degrees Fahrenheit (ie the soil should be free of frost),
  • Good soil fertility (for which you can use manure or fertilizer),
  • Proper drainage arrangements have been made,
  • The soil should not be too hard, it would be better if it is sandy and loamy.
  • Must be more acidic than basic.
  • It should be more acidic than basic.


In its native place, it gets a lot of sunlight and it is used to a warm atmosphere. Hence,

  • It requires 6-8 hours of sunlight.
  • It is better to get morning sun.


Of course, dahlias need the support of fertilizer to perform well. For this, you have to keep adding fertilizer to it from time to time, in which it is advised to use very little or no nitrogen fertilizer. If you want, you can also use compost or other types of organic fertilizers as a fertilizer.

Enough Room

Depending on the species of small to large species, these plants can be more than three feet tall and their flowers can be slightly larger than one foot. Similarly, their roots also spread to an area of ​​about two feet. Keeping these things in mind, you should plant them in the garden by giving them enough space.


Once you are aware of the above-mentioned scenario then you know which factors are mainly responsible for the good performance of dahlias. If your dahlia is established as per the mentioned point and still it is not giving flowers then the reasons given below may be affecting it. By identifying and preventing their causes, you can encourage flowers to come.

Why Dahlias Not Blooming

#1. Pest

Dahlias are luckier than many other flowers, as they are free from many pests. But this does not mean that no insect attacks it at all.

Dahlias are chewed by slugs with great pleasure. Caterpillars like to eat their leaves. Along with this, Japanese beetles also cause great damage to them. In such a situation, if you see signs of chewing or eating leaves on the plant, then you will need to take extra care of your dahlia.


The plant struggles due to the damage done by these pests and in many cases becomes unable to produce flowers. You have to make the plant pest-free by using insecticides etc. so that new energy comes to the plant and the production of flowers can start. Slugs can be eliminated with slug bait. Dahlias can be rid of caterpillars, Japanese beetles, and other insects using soapy water.

#2. Lack Of Water And Sunlight

Two main reasons why dahlias do not bloom can be a lack of water and sunlight.

Dahlias require a lot of sunlight. So if you have unintentionally planted it in a place where it is shaded most of the time and doesn’t get enough sunlight, it may dry up or fail to bloom to its full potential. At the same time, it will have a good effect on blooming even if the temperature is very cold. Is.

On the other hand, lack of water is also one of the main reasons why dahlias do not bloom.


Make arrangements for the dahlias to get full sunlight. Similarly, water 1 to 3 times every week from sprouting till early winter. Also, when the weather is hot, more water will have to be given. But, do not allow waterlogging under any circumstances.

#3. Fungi And Diseases

An element overlooked by most gardeners may be fungi and diseases. There is a risk of causing more damage than insects, but the worry is that it is a bit difficult to recognize.

Erysiphe cichoracerum disease is caused by powdery mildew. Due to this disease the leaves deteriorate, the plant becomes deformed, and falls. A similar disease is Fusarium wilt, in which the leaves turn yellow, then wither. Together these symptoms also start appearing on the plant and there is a lot of possibilities that the plant may die.


You can use fungicides to prevent various types of fungi and diseases. You can use serenade which is very effective for powdery mildew.

Another step is very effective in preventing powdery mildew diseases. For this, you have to apply neem oil at least every two weeks. If your plant is suffering from the disease for a long time, apply neem oil every week. Do this until the plant is completely healthy.

If the soil remains too wet, there is a risk of developing mildew-related diseases. These measures will not only increase the yield of flowers, but the plant will also be safe.

Sadly, there is no cure for Fusarium wilt. For the benefit of other dahlias and other plants, destroy the plant affected by Fusarium wilt. Similarly, if your plant is suffering from a viral disease, the only solution is to remove that diseased plant. It would be better to identify these serious diseases early and isolate them.

#4. Extra Growth Of Leaves And Bushes

Why Dahlias Not Blooming (dahlia bloom issues)

Many times it is seen that flowers do not grow on dahlias instead the leaves and bushes have become more developed. The reason behind this is to use nitrogen in the fertilizer. Of course, nitrogen helps the leaves and bushes to grow and prevents flowers from growing. Therefore, it is advisable to use nitrogen sparingly. Here you can read more about fertilizer.

#5. Deadheading

One of the major reasons why dahlias are not producing flowers is not deadheading. It may be that the dahlias used to bloom earlier but are not blooming now or their buds are not blooming properly. If so, then obviously you are not deadheading.

Deadheading means removing dead or dried flowers. When a flower withers, the dahlia continues to use its energy to make seeds in those flowers. In this process, the plant ignores the natural production of new flowers.

So when you remove the faded or dead flowers, the plant puts its energy into growing new flowers. The plant focuses its energy on the withered flowers until they are full of seeds or you pluck that flower. Obviously, by deadheading, you encourage flowers to grow.

Summary For Why Dahlias Not Blooming

With the above reasons and remedies, you can get out of the trouble of dahlia not blooming. There is no doubt that the dahlia is a beautiful flower and its prevention in the garden increases manifold.

But in return for enjoying its beautiful flowers, you have to give it some attention and love. Correct information averts many unwanted dangers before they occur. With the right care, you will be able to keep the plant healthy and its beautiful flowers will enhance your home and garden.

Back to Main Article   Go back to learn About Dahlia In Detail.

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